Horrible! Customer service

I made a cancelation of a MTN contract with Mondo, as I was not happy with the amount deducted in my account every month,it's more I feel ****** and angry coz it's not the money I agreed upon with their consultant, the service of Mondo it's really bad I regret ever knowing them, they don't treat customers good, all they do is refer you to another number, they don't answer their phone, sometimes you don't get assistance, I have been calling them forever explaining my problem, emailing their customer service, their response was not helpful also and consultant told me my cancelation is been processed, so I must wait, they will call me back which they never do, they still debit every month. This Company is bad news for me. I want a cancelation of that contract.