Buy bundles but don't get access

I have a pay as you go *** and usually buy data bundle. It is very expensive and double what it cost on pre-paid, even while I have my own device. I buy bundles from time to time, but has to struggle EVERY TIME to get Cell C to activate it. Although I get a text that my phone was recharge, I do not have excess to my internet, whatsups, calls or sms'e. I cancelled my contract with cell C because of numerous problems, and went over to pay as you go, but experience much more problems since then. Do they want to force us to take out contracts even with their bad service delivery? Why must I spend money and time to get them to provide the bundle which I so expensive paid for? Do Cell C want that money without providing the service? Can the customer protector assist wit an investigation? Must I rather make use of another service provider???