PATHETIC SERVICE FROM CELL C

I took out a cell c contract in 2016. It was 2 contracts and debit order amount was for R518 per month. My account was debited all odd amounts and then cell c handed over my account. No statements was sent to me and no contact was made. Now im blacklisted by cell c .. ive been calling them and emailing since the beginning of July.. experian sent me a statement saying that my account has been closed. Finally cell c legal dept called me saying i have 3k outstanding. I asked for statements to be sent. I received a statement last week for 7k not 3k. When i sent their social media team an email (lungile) asking why am i being charged additional 4k for CANCELLATION fees when the account was never cancelled. She sent an email saying the cancellation fees are for the devices i had. I asked to be taken up with a manager or legal dept as i still have the devices and feedback on the cancellation fees. No response receievd. Am i now supposed to pay 7k instead of 3k because cell c doesnt know how to provide their customers with a service.