Cellc disgusting customer service

Cellc has still not solved my problem, they called me the day after my last review, asking me to email docs again, i asked them to find the last 20 emails, they have been calling me every day and still haven't solved my issues, i have now received a sms stating all my services will be suspended because i haven't paid my bill, my line has been suspended from December 2021, im still getting billed for contract that has ended on the 3 January 2022, i was told 1st, i have arrears in July 2021,now its February and December 2021, they have admitted that they made a mistake and have not informed me, i am still waiting for the emails from them, now i am being billed for a suspended line. Can another net please assist cellc in solving they problems and how to treat they clients, as well as teach them some accounting skills and customer care skills.