Emergency airtime repayment

<p>I was with cell c for a while and i took R11 emergency airtime, Then i changed my network and i started receiving messages stating that my account is in the rears, I then phined customer care and asked how to pay back the R11. The lady gave me an bank account number and which i paid the R11. I still received messages saying that my account is in the rears, I probably phoned customer care 5 times and everytime i need to email my prove of payment, Ive done this numerios times and still i receive a message saying tha my account is 39days overdue, Can anybody from cell c contact me and sort this out, I am worried that cell c will blacklist me for R11 of which was paid a month ago. The service is POOR!!!!!!</p>