Unprofessional

I keep receiving emails with no content but with title ' Mobile Phone Account Limit Notification From Vodacom'. My line is now blocked from making calls despite being invoiced R299,01 and having a balance of R240.62. I recently signed the contract and now regret doing so. I phoned the Customer Service who could not help me, instead they want me to go to a vodacom shop and phone 'acquisition' to unblock my line. No reasons as to why the line has been blocked in the first place. She acknowledges the account is in credit. I think you are very unprofessional and for you to expect me to take a day off to fix an issue that is your problem is preposterous!