Mis-selling of contracts

Last year I took out a contract an LTE contract with Telkom. Two month later Mobile talk contacted me and said that I could upgrade my contract to a faster cheaper line. When I challenge the fact that I had recently entered a contract with Telkom they advised that I could cancel my existing contract with Telkom \at no cost\". This was not the case and I now have two contract running and Telkom refuse to cancel the existing contract. I have contacted Mobile Talk who listened to the original phone call (sales call) and acknowledged that I misinformed at point of sale and misold a new contract. They advised that if I returned the new device to them they would cancel the new contract and refund all payments on the new contract. I have returned the device but still the new contract has not been cancelled or refunded. I call daily and every time somebody advises they will call back, but they never do. I see there are multiple similar complaint on Hello Peter and Mobile Talk should be reported to the necessary regulators/ombudsman,. "