Telkom is the worst

Paid my May account in full, last day with Telkom was 9 June - I joined a different provider (I should have done that a year ago). Telkom sends me an invoice saying I owe them R805.77 for the 9 days of June that I had WiFi with them! Not only was your uncapped LTE cover pathetic for all the years I've been locked into your contract, now you're trying to make me pay for a service I haven't received?! Telkom you have a bad reputation and its clear why. I would never recommend anyone contract with Telkom for WiFi services. Ever.