Disgusted in service

In November an agent called me. Waquille is his name (spelling might be incorrect). He offered me a device and I made it very clear I do not want a second contact. He said he understood and we settled on the Huawei P Smart S. My new device came. December comes and I receive a bill from Telkom stating I now owe them for 2 devices. I immediately made contact with SellDirect and explained the situation... Ethna said she would lay a complaint on my behalf and someone would be in touch. 7 days pass and no response. I called again and spoke to Faatimah Jaffer who seemed very helpful at the time. I was promised the situation would be rectified before any deduction are made from my account.. Low and behold money gets deducted from my account for a number that was never in use. I emailed them with proof of deduction and to this date no response. I get a statement from Telkom now saying I owe them R4500. I call Sell Direct... All they can say is that they can send to the billing department and will get back to me. I am still waiting for someone to get back to me. I called and spoke to Faatimah again. Again promises are made that the situation would be rectified. She sent me an email requesting the invoice and sms's that I received from Telkom. I responded with all relevant documents and to date I have had no response. This started on the 8th of December 2020. How am I going to get my money back from Telkom? Can someone please help me????