Very bad service they provide to customer actually they misleading us

Good day i recently changed my banking details from Capitec to FNB the previous account is close so i payed my installment using eft but now i was told that i'll have to pay 3* the amount that i am paying monthly off which i feel it is unfair since i did not even relieve the copy of my contract i really do not they this is the right way to treat your customer it's the second time now i can never ever refer any of my friends or family to this pathetic company at this point and time i feel like when i took a contract with you guys it was more of me committing suicide