FNBConnection

I took out a FNB simcard for R65 per month, last month I received a bill for R245, I phoned the customer service and the lady help and assured that my account is fixed., meaning she set a fixed data rate not more than the R65 (1 Gig per day and 1 gig per night.) after our conversation I took out the simcard and put it away NO ONE WAS USING IT THE WHOLE MONTH IT WAS OFFFFFFFFFF!!!!!! Today I saw that FNBConnect billed me R495???????!!!!!!!!!!!*** R495 for what????????? I phoned and they told me its uncapped data now I would like to know whom authorized that on my behalf and where does this uncapped came from as this is not part of my FNBConnect contract that I took out last year.....Why now ???, I have not had these problems before and all of a sudden this is happening every month. I did NOT use that data and I would like to have my money put back into my account TODAY........ Sandra ***