Pathetic / no service

For the past 2 weeks I am unable to make or receive calls. My one contract expired and was on month to month basis. I upgraded the number last week but I am still unable to make or receive calls. I phoned Vodacom customer care and was informed that it will only be fixed next month. This is totally unacceptanle becausr I have already paid my account as well as upgrade fees! How can a person not receive the services that was alraydy paid for?!!