How do I update two UITableViewControllers from UIPickerView case statement

So I have two UITableViews in one ViewController, that are meant to be updated depending on the user's UIPickerView selection. I have two functions which call an API, and display the results in the tables.I want the table views to be updated, but currently, they new data is added to bottom of the table. My question is how do I update the table? I've tried calling reloadTable() on them, but nothing.

This is the function that calls the API, and displays the data

func fetchDataW() {        print("This is the Sprints rank function\n")        let url = URL(string: Constants.rankingAPI)        guard let requestUrl = url else {            fatalError()        }        var request = URLRequest(url: requestUrl)        request.httpMethod = "POST"        let group = DispatchGroup()        group.enter()        request.httpBody = u20VC.paramW.description.data(using: String.Encoding.utf8)            let task = URLSession.shared.dataTask(with: request) { [self] (data, response, error) in                // Check for Error                if let error = error {                    print("Error took place \(error)")                    return                }                // Convert HTTP Response Data to a String                if let data = data, var dataString = String(data: data, encoding: .utf8) {                    do{                        dataString = "<table>" + dataString                        let docu = HTMLDocument(string: dataString)                        let elements = docu.querySelectorAll("td")                        let first5 = Array(elements.prefix(55))                        let first = Rankings(rank: first5[0].textContent,                                             mark: first5[1].textContent,                                             wind: first5[3].textContent,                                             name: first5[4].textContent,                                             club: first5[6].textContent,                                             yob: first5[7].textContent,                                             plc: first5[8].textContent,                                             location: first5[9].textContent,                                             date: first5[10].textContent)                        DispatchQueue.main.async {                            tblWomen.dataSource = self                            tblWomen.delegate = self                            tblWomen.reloadData()                        }                        listW.append(first)                        listW.append(second)                        listW.append(third)                        listW.append(fourth)                        listW.append(fifth)                    }                }            }            task.resume()            group.leave()    }

And here is my case statement for the PickerView.

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {        switch row {            case 0:                u20VC.paramM = Parameters.u20_100mParamsM                u20VC.paramW = Parameters.u20_100mParamsM                self.tblMen.reloadData()                self.tblWomen.reloadData()                self.fetchDataM()                self.fetchDataW()        default:             ...}

Each time a PickerView item is selected, the value of u20VC.paramM and u20VC.paramW are changed to the correct HTTPBody parameters, and the functions that make the API call(fetchDataM() and fetchDataW() ) are called.

The DataSource is in the function running on the main thread.

Where do I call the reloadData() function?