They demaged my phone!!!

I made a follow up on my BlackBerry Z3 that was damaged by Autopage employees when they (Chris) wrongfully inserted and later (Harold) tried to remove a micro sim from my phone. Keith Kelly called me on 11.05.2015 to say Shannon (Manager) instructed him that the store will only pay half the cost to damage R880 and I refused and asked to speak to her. I called all day on 12.05.2015 unanswered and when I finally got through I was told Shannon had stepped just stepped out. She calls me this morning to say the cost to damage is R550 and I am liable for all of it and denies ever saying they will pay half. She says that was AN INSTRUCTION FROM HIGHER MANAGEMENT OF THE STORE. The cost to damage has gone from R650 to R880 and now R550 I do not trust anyone I speak to at that store, they are pathetic ***** who protect each other at the expense of a customer. I regret the day I ever stepped into that shop and I cannot trust them, which is why I refused to have them fix my phone. I am taking legal action for sure. I will NEVER deal with this shop and can NEVER recommend them to anyone. They are ******.