Threatening clients and harassing company

Unprofessional company wanting to ****** money alongside standard bank who is harassing clients to make payments which have already been made and insisting these payments are in arrears! I have sent through proof of payments almost a week ago to be allocated, I have continued to follow up with Standard bank, iv had no response! I have a reference number! The attorneys act in such a way to treat clients like ********s yet it was negligence on standard bank to not update the records and hand over accounts to this company who send emails for clients to pay up the entire vehicle amount not just the installment!! This is not the first time I have had a problem with this company and standard bank! They do not check their records but just harass clients for money that has already been paid!