Double debiting of account

I have a problem with the billing system, which of course is captured by inconsiderate and inefficient employees,. This company keeps on debiting my account twice, on the 15th and the 1st, of which I don't understand. This is happening for the 2nd time, I never agreed for my account to be debited twice, I only agreed for my account to be debited only on the 15TH.

This state of affairs is denting my name badly in the bank, the costs attached to non-payment and debit reversal, who will pay for such?. I keep on calling, which is also costly as i use my cellphone, their WhatsApp no. is never responded to, I can't continue to call and remind them to do their job efficiently, this is so frustrating to us as customers.

The last time it happened, I called and was assured that it will never happen again, and it has happened again, I'm very angry with this company.

Angry customer