Prepaid customer treated like nonexistent

Ever since I have stopped being a contract customer me and my husband are battling real hard with network and our minutes disappearing just out of the blue. I just called Cell C and spoke to Thabiso Mampo who told me there is nothing he can do but escalate the matter because it may be a technical error on his side not sure what that means. Everytime we buy minutes and airtime they don’t even last a week then they disappear sad part is they can’t even check what is happening. My husband bought 240 minutes on the 19th May and today Sunday at around past 9pm he received a sms that he has 192 minutes but when you checks his balance it’s says he has 0 minutes, we have minutes which we bought with our money but we can’t call because CELL C has issues. When we were still on contract we were treated in a proper way now that we are not network is an issue EVERYDAY our phones are on “no service”. I know I have been a good customer whilst was on contract but if this is the treatment prepaid customers get then this network does not need to be listed as a network because it’s always bad. Lastly I was out of the country 2 week of May and what was supposed to be roaming was not roaming that service did not work AT ALL!!!! And I just wasted my money buying R100 airtime for both phones because international roaming has never worked till I came back to South Africa.