Beyond frustration

Why is Budget Rent a Car allowed to take money out of your banking account without producing and invoice for payment?? and when you try and get copies of the amount due you get shifted from one person to another or told that you cannot have an invoice until the amount is paid?? No where can you find a telephone number or an email address for an accounts person. In the interim they are still trying to debit my account which costs me R50.00 everytime they try. We also supposedly signed for a waiver which we were not told about. No questions asked and no information given my the person at the counter. Sign is all you get told! No paperwork, no one to check the care before you get into.