Bad service on WhatsApp contact center

I have requested to client service via whatsapp to change the debit order date from 15th to 25th each. The simple request costed me to created three debit orders without explanation. Client Service says is collection department, collection department responded to them is system without giving solution. Client service team leader is not caring and telling me I should accept the problems as I pay for risk.

Challenge about the pineapple is that clients cannot call them, clients can only whatsapp and receive their calls as per their options to the enquiry.