Cell C - terrible payment recognition and customer service

I have a phone contract with Cell C. I pay my account via eft. I have had frequent issues with my payment not being allocated to my account. I use the same bank as Cell C and quote the correct reference number as they request. The last unallocated payment issue took months to resolve despite speaking to several “customer service” agents and sending countless emails with the proof of payment attached. I am now once again faced with the same issue: payment made after I received the invoice, proof of payment sent. However, I am still being sent notifications that my account is about to be locked. I now have to look forward to wasting hours on the phone to try get someone to help. My first encounter with the help desk is the call being dropped when the agent couldn’t help me and had to transfer me to a different department. This is a truly excruciating experience and I would definitely not renew my contract with Cell C.