UNAUTHORISED DEBITS FROM MTN-MTN IS A ****

On the 18th of December 2020 i sent an email to MTN to Cancel my Cellphone Contract Together with Cellphone insurance.I received the confirmation of the receipt of my email and my follow up email advising me that my Number was Migrated to prepaid, the last debit that MTN was supposed to make on my account was on February, In March they debited my account and i called MTN and the Consultant advised she will look into my query as they were not supposed to debit my account and gave me a reference ***.On the 1st of June a debit went out that is even much higher, called MTN again and they advised its not Cellphone Contract But Cellphone Insurance, I was then given a number to Call the MTN Insurance and spoke to a consultant by the name of Lebohang Motaung Who could not answer any most of my questions as to why would they debited my account after some months without even sending an invoice or calling me as they have my Numbers,No assistance whatsoever from her side,After speaking to her i Sent another email to MTN customer service and complains, there was no response or any auto reply to show that their emails are still working, Today again the 15.06.2021 there is still no response or acknowledgement of my email even after sending reminders.