Dismal customer service from Cell C

This is just to share my utter dissatisfaction and disappointment in the utter bad customer service received from Cell C by my wife.

My wife has had a LTE internet contract with a device with Cell C and this year the two years were done and we decided not to renew the contract. Cancellation was not seamless and we eventually were told one month's notice was given and after one more deduction, the account will be closed. We are in the process of buying a property and this is now more than two months since we closed the account but this account still reflects against my wife's name as open and a possible arrears / outstanding amount.

For the past two weeks she has been calling out, I do not know how much airtime and could not get hold of an agent in Cell C's Customer Care. Today I decided to call the branch closest to us and was referred to Customer Care. After explaining that we not getting anywhere with Customer Care, I was told to try again, which I did on my wife's behalf (bear in mind her trying of two weeks and also the tons of airtime wasted). I got hold of an agent and explained the situation but was told that my wife should call, instead of myself. My wife tried calling again and after a few tries got through to an agent who asked for her personal details (Name, Surname, Number being queried and ID number), after which she was told that none of the details are picked up on the system and that she made an error. This is even though she is reading her ID number from her ID card. When asked to check again, she was told to put down the phone and to call back. This is a repeat of when she called them to cancel the contract a few months back.

All we needed to know was is the account closed, is there any outstanding / arrears amount and how this can be seeing that they deducted the payments via debit order every month.