Termination of Contract(s)

Despite giving 30 days notice to terminate/cancel my 2 MTN Contracts ending in December 2023 and February 2024 I was still debited in March 2024. I have emailed, received calls and actually all instructions have fallen on deaf ears. From the start of Written email cancellation requests in accordance with their Customer Care Centre backed by emails from said Centre NONE of the instructions have been followed through. To top it all I was debited with a further 50% on the March 2024 Debit Order. Now I'm being told that my Bank can only put a temporary Order on future deductions and MTN must cancel the Debit Order instruction from their side. I ask you with tears in my navy blue eyes (they're brown) what are the chances of that heppening when it has taken since November 2023 to get nowhere!!!!!!!