Router contract cancellation

I was sold a router by a tele-marketer. She **** about the upload and download speeds so I returned the device to MTN head office in Johannesburg. MTN helpline told me to take it to my nearest MTN shop. The MTN shop at Campus Square, Melville refused to take it, told me they couldn't were because they are a franchise. They sent me to Cresta. I phoned the MTN shop at Cresta but got no reply. Later I was told their phones were off-line, they also told me they couldn't take the device as they were also a franchise. Head office is over 'there' with a sweep of arm through the air was the response to where MTN head office is. I search GOOGLE MAPS for MTN Head Office and was guided to a shopping centre where I'm told there has not been a MTN shop for more than 5 years. I gave up! On my way home I happen to notice big yellow signs for MTN. It was the head office (it was 3 hours since I stated on the journey) I handed the device back and got a IRMS (reference) number and was told to phone in a week to confirm that the contract was cancelled. I have since called more than 24 times. Calls were often dropped and every time I got a reply it was confirming the contract was cancelled but I had to phone again to make sure! I never got an e-mail to confirm cancellation. Payment went off my bank account last month. When I queried that I was told ot will be reversed. It hasn't. Today I was told to phone MTN direct billing to ask them to transfer the money back to me (wich apparently is available in 'my MTN account') I phoned at 16h25. The automated reply gave me 3 options to choose from, none that app**** to me. Next payment may go off in a couple of days! Worst experience ever!!!