Bad service

Im so angry right now I can scream. I had a Blacberry 9300 that went in for repairs 3 times within the first year.I request a different model and was told to make contact with head office. After calling 5 different numbers I was told to contact the branch that did my upgrade. I then had to send my complain via email to the branch who did my upgrade and waited for a response till today. Today I called 4 different numbers and still no one can assist me. Everytime I speak to someone I have to explain my situation over and over. I really had enough now and is hoping someone can assist