Electric deposit not being paid back accordingly.

I moved into my new place mid March. Paid my electrical deposit fee which was R2 500 then and pre-paid meters were installed in our residence on the 23rd of March 2021. I completed all the relevant termination docs and signed for the new meter on the same day. Pro-Admin promised me my refund as soon as possible and I was advised that it would be done as a matter of urgency.(as we only moved into the new property a week before installation and me paying the deposit). On the 25th of March 2021 I was advised that they will get the final meter readings that day and then they will process the refund payment. 26 March 2021 I got confirmation from Piet @ Pro-Admin that the final meter readings were received and fhe company will process my refund. Since then I have been following up numerous times without receiving my refund. I was finally advised in the 2nd week of April 2021 that the company pays refunds on Fridays and they want to do a bulk refund for all the units in my complex(otherwise it takes too long for them to process). This is understandable and I agreed. I was then promised that my refund will be done by no later than Friday the 16th of April 2021. To this day, I have still not received my refund. When I phone, Piet & Denise promise to look into this and phone me back, but no one has contacted me back yet as promised and no one is responding to my email queries. Why is it that this is taking so long and that empty promises are being made, and no one responds? I am very unhappy with this service. The deposit is MY money and should be paid back to me accordingly.