Bad Customer Service/ Repairs Issue

On the 8th of Feb i took my phone to Vodacom Repairs in Cresta, as it was not reading my sim card. The job number i was allocated was ***1. Finally on Wednesday i was sent a notification that my phone was ready for collection. When i got home i realised that the back speaker was now not working, this was working before i gave the phone in. On Thursday the store was closed due to load shedding at the mall. I called in today to report the fault with the speaker, and i was informed by Carlo that i should speak to the repairs manager Leon as he was unable to assist me. The problem is the contact number he gave me for Leon *** either rings the entire day or stays engaged. i made Carlo aware of this but he just dismissed my concern. i called this number at 13:05 after my conversation with Carlo and as expected no one answer. I am really disappointed in the lack of concern that the staff at the repair centre show. I need not stress how important my phone is. This is a service i pay for every single month and the customer service i get in return is really appalling. i would like some assistance with this matter as soon as possible.