Querying Contract Charges

I upgraded my contract and it came as an Open Contract and after i called the Call Centre i was told i could set my limit to 0, and i would not be charged anything extra except for my monthly subscription of R249, i dialed *141*5# to manage my usage and set my limit to 0 as was advised be the callcentre agent.<br> To my shock i still received an invoice of R2400 in July and R2600 in August, and yet my limit is set to 0 and i do a recharge top up every week!<br> I need an explanation as to why i am still being charged contract rates if my limit is set to 0, and i recharge to inorder to use the services.<br> How is it possible that i can be charged R5000 in a space of two months if my limit was set to 0.<br> i NEED ANSWERS PLEASE. R5000 is hardearned money just to vanish without an explanation.<br> I logged a query on the 28th of August, i asked for an itemised bill i was told i would be called within 24-48hours. NOONE has bothered toc all me or give me feedback on my query Reference Number ***.<br> This is unacceptable!!!!!