String Trimmers

I bought a husqvarna 323 string trimmer back in April 2014 from Western Auto in Louisville, MS. The trimmer would not idile right at the time of purchase so the mechanic worked on it for a min and finally got it to idile. Well I took it home and it wouldn't idile at all during use. I proceed to take it back the next morning for them to look at it again. Again same results the mechanic states its fixed and appears to idile. I get it home and once again nothing happens. I call the dealer back the following Monday and they tell me they don't know what to do but there is not warranty/return policy on it. So, I continue to run the trimmer for about 2 more weeks until one day I have to run it on choke the entire time for it to work. After this the trimmer would not crank so i proceeded back to the dealer. They have had it now for 45 days and have made no progress in fact, I stopped by the other day to check it and the motor was in several pieces. What can I do to get this corrected. I done an in store finance and am paying for something that doesnt work at all. However, they did give me a trimmer to use for the time being but it was a return also with the same problem and it is only a 125 I believe. Please help