Cutting my losses

Seems like the only form of communication with Wonga is through Hellopeter. I settled my account on the 25th of June 2020 and till to date, I have no received any form of communication. I sent my proof of payment to both law firms and yet I dont receive any assistance. I just want to cut my losses with Wonga. Seems like I will forever be indebted with Wonga. All I ask for is for my final paid up letter.