Poor conduct and customer service

They have been sending me messages for my Telkom account and I just accidentally double paid their account. I have called numerous times and sent the proof to show payment, no one is getting back to me regarding the confirmation of them receiving the proof of payment. The one agent I spoke to on the 29 of September 2025 had advised that she will call me back yesterday and never bothered. I called again today and she advised that she was still checking their whatsapp and that she will call back after 10 minutes and she never bothered.