Builders the worst customer service ever!!

I have never struggled with a company like this before... I work for a private company with Covid and all it's financial implications, I was paid a few days late. I don't get my full salary not even close. But my first priority is my accounts. So with builders my debt order of R203 didn't go off on the third of July. I paid my account via eft a amount of R300 on the 7th as soon as my salary was paid, got the bank account on builders website. Wasn't sure which beneficiary to use on app. Up to now NO PAYMENT REFLECTING after numerous calls, emails to payments department send proof of payment 3 times!! I cancel debit order on my app because they will debit the double payment this month! Again registered with self service to instant eft payment AGAIN no payment received. Now it's interest on my account, bad credit score just because they can't help you over phone or no I mean they don't want to help you! What more can I do just for you to rectify my account!!!