Extra payment not reflecting/no response

I've made a loan the 28/12/21 and made a payment 2 days before my debit order was supposed to come off. The debit order came off the 28/1/22, but up to this day my extra payment does not reflect. I've tried phoning but the numbers does not exist. I emailed several times to enquire about my R500 extra payment. Automated messages are sent and no one ever contacts you. Does anyone have a contact number for them please??? I'm ever sorry that I've taken a loan out with them,their service really sucks!!! I personally feel that they are *****ing from us instead of helping us. I tried to dispute the payment with the idea that they'd contact me,but it unfortunately cannot be disputed. *** is up with this company??? I'd never recommend Fasta to anyone as they are the worst loan company that I've ever come across. It may be easy to apply,but more difficult to get assistance or in contact with them. Could anyone assist me as to what I can do please??? Claudia