Very bad customer service 😡

I write this email with enormous dissatisfaction and disappointment regarding the service I received from HomeChoice. Last month in May i asked for a settlement letter online of which was sent to me. On the 2nd of June 2023 i settled my account in full. They had sent me this;

Reminder: Dear NELISIWE PLAATJIES, pay R6241.33 on your Homechoice account by 08 Jun 2023 as promised to avoid additional costs. Call *** I called them to say i had already paid and they said I must send proof of payment and I sent it. Mind you i paid on the very same account number i used to pay my installments. They've always sent me messages to say they received payment but all of sudden they can't see the money i payed and don't want to update my account. When I keep calling them, they put the phone down in my ear. Will you kindly assist me with this as tomorrow is the 8th and theres going to be additional costs.