supposedly new exhaust system

Terrible rip off artist... took my vehicle there after a winter storm they were the only muffler shop in the area that was open unfortunately and I had to have my muffler completely replace from the snow storm they told me it was going to be $300 to get a whole new exhaust system, 3 months later the muffler broke and fell apart went to take it back in to have it fixed and was told I had to pay $20 for parts because when they installed it the first time they basically rigged it up a week later it breaks again and we come to find out that they did not replace the whole system like they were supposed to do and what we paid for they only replaced half of it in which they ripped us off and now they want us to pay another $150 to repair what should have been repaired in the first place, nothing like paying 300 dollars for it make load noises when I drive and rattles when I'm ideling.