Useless Cell C!!! Fedup!!!

I have so many problems,phone the call centre everything gets escalated to heaven knows where. nothing resolved and no feedback.<br> 1. the wifi call that is deployed is the worst thing they could do to their already bad network. i cannot switch this off on my s6 (Samsung did not do the update on their side - Cell C customer care personnel shifting the blame) and I use wifi at work. call quality is so bad. so frustrating. so every time I get a call while connected to the wifi, i have to reject the call, switch off my wifi and make the call again.<br> 2. i load airtime then buy a data bundle. i go on facebook a little, check my balance then I still have data left, but almost no airtime left. did not phone or sms, where is my airtime? if I still had data left on my phone, surely my airtime was not used for data? did it go to the same place the escalations went?<br> 3.at times I cannot make phone calls ,send sms or load data as it says I do not have airtime.Check my airtime balance,then I still have sufficient airtime.reported all of this so many times I lost count.have tried all the quick fixes,did not work.will you be able to attend to this?or are you as bad as the call quality on wificall?