Not delivering service as agreed

<p>A while ago i phoned vodacom customer service to put a limit on my phone bill as my previous phone bills was R1000.00 plus, and vodacom could not give me a invoice or statement of how my bills got to such high amounts. I agreed to a limit on my account of R360.00 wich worked for a month or two. My bill for July was R2455.00 . Plus i am using a portable wifi with 40gig data so i do not know how my bill can get to such high amount. I really feel that i cant be held liable for this, as vodacom and myself has agreed to a limit on my account and they where not doing their job properly and now i have to sit and pay for their mistake!!!!</p>