MTN Service Provider cellphones

I called MTN in September to cancel my modem account and had to pay a cancellation fee which I did. They however didn't cancel the account and continued debiting me. When I called them to ask why the account was not cancelled, they told me it was due to the fact that I didn't call in to cancel it and that they used the money for my invoice charges. Be careful of MTN as they do not deal with complaints like other companies and will not try to resolve your issues but will keep trying to get more money out of you. I will never take another contract with them and will rather use a more honest and customer friendly service provider.