Poor Service

Hi... I've made a payment on the 9th of May 2022 for internet installation but afterwards requested my money back as the fibre lines was not active in my area at that time and took out a LTE package with Telkom. Ever since that time I've never received any refunds and have been in contact with there customer service. They requested that I should send proof of payment as well as my banking details... I've sent through everything and every time they said that my account number was not clear enough and that they sent everything to Vumatel and that Vumatel are responsible for the refunds and that they must pay me back. I don't know what to do anymore and would like my money back.