Wonga blake and associates very very bad service

I have had the bad experience ever. I was supposed to pay my wonga loan account this month in full. That was the payment agreement for december. I have made a payment on the 25 December 2019 of R1764,71. And i sent them proof of payment to update my account. The proof of payment was sent several times to :*** When i call to confirm if they received the proof of payment, all they say is they haven't received the proof of payement no one seems to help me. And the other thing is that my loan account keeps on accruing interest. I don't know what is so difficult for them to trace the proof of payment i sent. I feel like they doing it intentionally so that my account will accrue interest. This is really bad service its not my fault that u guys cant your mail system. I have also ccd this email as well so that they wont give excuses :***. Please note i will never pay for the interest accrued because its not my fault that u guys cant get my proof payment. And i just called now and i spoke to some guy who is not even helpful. Im so ****ed. Whats so difficult with solving such a small query. Just to check for the proof of payment and update my account.