BAD BAD AND POOR SERVICE

I bought a phone a zte blade L2 for cash at Edgars in Bellville in August 2014.After 2 months It went faulty with the menu and home key buttons not working and i took it back to Edgars for repairs in October 2014 and up to now my cellphone hasnt been fixed. i have sent it for 5times and still nothing hasnt been done.the first time i sent it in they changed the software(which i never asked them to do) WCH NOW CAME WITH A NEW IME NUMBER WHICH DOESNT MATCH THE ONE ON MY ORIGINAL BOX. Still the keypads wernt fixed and i sent it back to Edgars VORTREKKER in bellville. it came bek not fixed.3RD TIME NOT FIXED AGAIN. 4th time was asked to take it to TYGER VALLEY it went as far as Johannesburg still not fixed now with a story of the IME number not matching, sent it back for the 5TH TIME STILL NOT FIXED. ime number story. vodacom, are these your tricks not to repair my phone, how is that my problem that you changed the number, isnt everything in your system>. CAN THEY PLEASE REPLACE MY PHONE OR PLIZ REFUND ME ASAP.