MTN CONTRACT

My contract finished at the end of November. Normally the contract would run on a month to month basis until I was ready to sign a new one. This time MTN took it upon themselves to change my package without consulting me telephonically or otherwise. I got an sms to say I've been successfully subscribed to some package I knew nothing about. I went to an MTN store to enquirer &!the consultant logged in a complaint. ***** was suspected. Two weeks down the line nothing's been sorted. I phoned customer retentions & conveniently the system is off line. So come the end of the month what will I be paying ? Is it going to fit in my budget? Is the right way to treat customers????