Suddenly I'm not good enough

I've been a Vodacom client for more than 10 years. I've had a contract with them for at least 5. For the last 2 years I've only been using prepaid. Then I phoned to apply for a contract again. One random credit check and sorry your request has been declined. No explanation. I do not have any bad debt, I've never missed a payment to Vodacom and I earn more than the average person. Why would I not qualify?? Why will Vodacom not take into account the good track record I have with them the last 10 years. The only bad thing about my credit record is I had 5 late payment to edgars. Non of the amounts was more than R40. All my other account including a homeloan, car loan, student loan is paid on time. Is this really the best credit assessment Vodacom can do? If they don't want my business I'm happy to take it somewhere else.