MTN failing to take ownership for misleading sales call

I was mislead on a sales call, now my account was debited with an amount more than my contract, I called yesterday spoke to a useless Khensani, who wasted 20 minutes of my time, ended up transferring me to a department that's not working. This morning spoke to a guy, that dropped my call, I called again and spoke to Gcina, who was patient, however referred me to a third part, and apparently the number was incorrect. How does MT allow third parties to call on their bahalf, and failing to take ownership of their contract with their third parties.? Please listen to the call recording for the 12th June when your sales consultant mislead me. I'll reverse the debit order and won't make a manual payment, until MTN sort out this mess.