So sick of this company

I have had endless problems with Cell C and its starting to annoy me. When I load airtime to my pre-paid sim, it disappears into thin air, when I load WhatsApp bundles within 2 days its gone and even though I have data on my phone my airtime goes but my data still remains. I have complained to Cell C about it numerous times using their call center and even walking in to Cell C Cresta, the feedback is poor I had to basically Beg the supervisor Thasveer Davnath for feedback he said he would call but still I had to call back to get feedback as he took forever to respond then the feedback they sent is a page with lots of numbers which I don't understand what it is and when I asked for a detailed explanation all I was told is that the report is valid. And funny enough I have a contact with Cell C but when I use the contract sim I don't have any issues. Hopefully this complaint will get me some explanation or feedback or any of my data and airtime returned as I am so sick of Cell C and their pathetic service. I want feedback ASAP