Unhappy

I was at Budget rent a car on 10th August to rent a vehicle, firstly when i called i spoke to somebody regarding a vehicle she gave me the amount i needed to pay, when i got to the airport another lady assisted me and advised there is a holding fee that needs to be added, i paid for the vehicle and paid an amount of R4446, on the 25th i had to return the vehicle but i also needed to extend, they then said because i never used the amount of kilometers given free i need to pay an amount of +- R2500 again as holding fee for extension of vehicle, i paid it and returned vehicle 8th September, upon returning the lady assisting advised me that refund would be done between 7-14 days, on Tuesday i got a statement showing amount owed to Budget, and upon checking my bank statement there was an amount of R6800 pending for Budget, if i calculate correctly it is the 2 holding fees taken and amount that i needed to pay for vehicle, this morning i got a notification that budget took amount of R4446 from my account and the R6800 still pending, i went to FNB which is my bank they advised there is nothing they can do, Budget car says they will send communication to FNB for the funds to be reversed, nobody can tell me what happend and what is the correct amount im supposed to recieve as in the first place i paid a holding fee twice, on my bank statement there is an amount pending and still an amount was deducted today, my account is now in a negative of this R4446 and everybody is throwing their hands in the air.