I am denied another contract for no reason

I have always stayed with Vodacom due to their high level of service, but as of late they have not helped with anything. I phoned regarding an increase in the amount of airtime they load on my phone every month, they declined to help etc. but today i have had enough. i contacted the sales as i want to get a contract phone for my Fiance. The contract was declined for no apparent reason. I can afford it. i do not have a terrible credit record. I have been paying my contract every month and still Vodacom declines me. I think it is time i move to cell C. Vodacoms really going to the dogs.