THE WORST SERVICE EVER

I have two accounts with Finchoice the one a Mobi Account and the other a 12 Month Fixed account. I requested a settlement letter for the mobi account paid it before the date they requested on the letter for the amount they quoted. I also paid a double installment on the 12 month fixed account. All was paid on the 6th of September 2021 today the 14th of September 2021 payments have not been allocated and the settlement for the account I settled still not reflecting? I have send in total 11 emails with my ID in the subject box and proof of the payments attached. What more must I do I receive emails confirming that my payments was received but when I phone I am told that I must send proof of payments! There is nobody in this Company that can assist PLEASE I NEED HELP GETTING THIS SORTED!