Brakes and Service John Phillips Charged triple part cost and still did not complete repair Knoxville Tennessee

 The work was done on the side of the interstate on a rainy day. There serpentine belt was broken and spun around the crankshaft pulley so far it was under the timing belt cover. I pulled out what I could see and replaced there belt. They drove off and befor they could make it to the exit ramp it died on them again. I examined under the hood and found the serpentine belt had come off the pulleys half way. There plug in port for a diagnostic machine didn't work. They took it to a part house to get there existing check engine light checked and couldn't. I found the blown fuse and replaced it. I ran the scan and it showed an issue with the crankshaft sensor. They had it towed to the wife's work off merchants center drive. I came out and replaced the sensor and the car ran for a day. I came back out it the pouring rain and found the timing belt had slipped. I gave them an option to get it fixed as a complete kit or just a belt. I found a bad idler pulley that looked like the issue with the serpentine belt. They opted for the less expensive option. I replaced the timing belt and fixed the issue. I replaced the idler pulley and had the same issue with the serpentine belt. I showed her husband the issue and took the pulley back off and didn't charge them for it. I recommended they take it to a shop that could diagnose that issue seeing how I was not sure what it was. They called me a few days later telling me the belt came off again. They asked me where I bought the serpentine belt and I told them. There isn't much else I know to do. I recommended they take it to a shop to find out what the issue was with the serpentine belt jumping half off the pulleys.