I have been using Vodacom contract for over 10 years n i completely loved it until i received a call in April about receiving more airtime on my package but not paying more for it by a Vodacom consultant

I have been using Vodacom contract for over 10 years n i completely loved it until i received a call in April about receiving more airtime on my package but not paying more for it by a Vodacom consultant. Now my contract went up by R500 which i don't even have n can't afford ,when i called in at vodacom about my problem they told me they will sort it out in seven days n its over 7 days n when i call they giving me the run around n saying no agent has been assigned to my problem,meaning no investigation has been made n now il b due to pay again the R500 that i don't evn have...i want to just end this mess n my contract n never look back at vodacom