iPhone damage not being resolved

My screen was broken in middle March 2015. Went in for insurance repair and nothing happened for 2 months. Returned (screen still broken) and further damaged - casing scratched - by Vodacom whilst in their care. This was reported immediately to them. Fixed the screen myself at an iFix store. Now 10 weeks later and they still wont sort out the damaged casing PLUS they now have the audacity to tell me that I have voided the warranty on my handset because an unauthorised retailer repaired my phone - why wasn't this told to me when I was waiting for 2 months for them to fix my screen in the first case??<br> Alisom / Vodacom's service has been disgusting. <br> I have followed up with them EVERY week since the initial screen issue and they never get back to me. <br> This isn't how you treat a corporate customer who has been loyal to Vodacom since cell phones first came out!