Bad services and bad client services

I have a contract phone which I took out last year September 2014 by Mtn. Soon after that I was ****** on the train (travelling from work to home) Insurance gave the phone back. On Sunday 5 July 2015 my Samsung S4 decided to go dark/black on me. (Screen black out) So yesterday 4 July 2015 I took my phone to Mtn In Worcester Mountain Mill Mall where I bought it, only to find out that they not gonna assist me with repairs. I don't understand cause I bought the phone there and its not even a year ago, and my payments is up to date. Lady said I must take my phone in myself to Samsung, She was so helpless and gave me nothing, information wise I mean. She also said its not there responsibility to fix it cause they didn't issue the phone from there store. But I got the insurance from there store quick,quick. This is not the first time I get bad service by them and I still have emails to proof that too. Please help? Cause I'm sitting with a broken phone and no one I called so far is helpful. FYI. Worcester don't have a Samsung store. Looking forward hearing from you. Regards Megs