Bad service from repair centre

Handed my phone (Sony Xperia Z3) in for repairs on the 6th of June for a faulty speaker. 2 weeks later when I went to pick it up the person at the shop told me that during the repair the glass had been broken but they had repaired it. Upon checking the phone I noticed the entire bottom metal piece of the phone was dented and scratched. I handed the phone in in perfect condition and thought it was unacceptable to hand my phone back to me in that condition. I was then promised they would fix it and it would be prioritized and I should get it back in 5 days. Vodacom denied my request for a replacement. whenever I try and find out what is going on with my phone, every day the only response I get is \we don't have an exact date for you but it should be tomorrow". Then last week 5th July"