Unable to repair a damaged cellphone

About a month ago my cellphone was taken in for repairs,I was told that the insurance would fix the phone I would however have to purchase a new battery for the device as my insurance does not cover the battery. Nonetheless I received my phone back and did exactly as advised bought a new battery to my surprise my phone still doesn't work,it switches itself off. I called back the insurance and told them what the problem is and they haven't helped me or it seems as though they are refusing to assist. I find it funny that its ok for a person the pay monthly premiums but when its time to get assistance a person is being made feel like they are doing me a favour, I paid my excess and I'm given a phone that doesn't work. I'm sick and tired of insurance companies constantly taking clients for fools,I'm waiting for their call and I must continue to use a faulty phone lose out on important emails because my phone doesn't work.