Bad Customer service

I had paid my account via EFT on them 29th of November tried calling to find out if the payment does reflect because they also debited my account but they kept on saying it does not appear on their system only the amount that was debited is reflecting they sent me the email address for their customer service to send the Proof of payment i sent it but there was no response I have sent almost 4/5 emails with an attached proof of payment with my details and contact number so they cam allocate the payment up until today no response from them what type of service is that seriously I am really disappointed,irritated and more than frustrated by the service I m receiving from this company.