Terrible customer service from Vodacom store.

Took a phone to Vodacom store December 3rd 2020 for screen replacement which was booked on the 11th Dec for repairs, made the payment on the 30th December after having been advised by consultant to do so. I have not received any feedback concerning the phone ever since. I recently find out that the phone has been in a possession of the store as of the 29th December unrepaired. I went to the store on the 5th Feb 2021 brought the matter to the manger's attention whom confirmed that the phone is with their store but did not give it back to me & was told to sent a formal complain regarding the matter, I did do as advice and still no response. This is a contract phone which i have bought at their store that i am still paying for it, i have been without a phone for 2 months full going for 3rd now. All I want is my phone back and a refund on the repair payment that I have made.