MTN - What a disappointment!

So, last year I was sold a contract for Wi-fi. It did not work. Then, after numerous phone calls and visits to our local MTN shops, they realised the wrong contract was sold with the handheld '****le'. So, they confirmed that I will be reimbursed and that I can just send the apparatus back if I provide a reference number. This was done in July 2021. Following up constantly, they finally *****ed up in October when they canceled the wrong contract, charged me the cellphone contract's balance of 2 years that I took out in January 2021. Can not change it, it is my loss. Yes, I did cancel the debit order. Still, the contract for the wifi is not canceled, I am still paying this contract because it is part of my package. I have been with Mtn since 2001. Why so self-entitled Mtn? Where is your customer service? I was not wrong and I have to struggle for 7 months already to get a contract canceled and to get my money back or at least credited to my account, for a mistake your staff made?