Unreliable

On the 3rd of December 2024 I erroneously transferred R15 000 to the MTN Contract account number. I then called MTN and spoke to an agent who requested that I send through the proof of payment and the banking details of the account where the monies were transferred from and the refund will be processed with in 14 business days. On the 19th of December 2024 I called MTN and I was instructed to resend the proof of payment and the banking details and this they promised the refund will be processed in the next 7 days. On the 24th of December called to enquire about the status of the refund and I was requested to resend the proof of payment and banking details (for the 3rd time) and I emailed MTN (boss@mtn) and relayed my frustration. I received a response the following response: " Yello Cindy, thank you for getting in touch. We apologise for the inconvenience caused; we are pleased to advise that your refund request has been processed successfully. The reference for the refund is SR # ***. Please allow 5-7 business days for the funds to reflect in your bank account balance. Thank you for reaching out. Have a Yello and a safe day. Warm regards, Irene". I've been emailing MTN for an update since the 14th of January but my emails are not answered. When I call the MTN contract department, each time they request me to resend the proof of payment and my banking details and I'm given the famous line "refund will take 7 business days". This is so frustrating I honestly don't know what to do anymore.