MTN Bunch of rogues

My contract ended in Feb but they are still depositing the full amount with an additional fee. They also don't get back to my email queries and cut the call when I phone in to cancel. I reversed my debit order twice now in hopes that they would call me but no such thing. Just told they will cancel my service. Do so MTN! You are a bunch of rogues and useless to say the least! I won't be using you further