Walmart Automotive walmart fuel injection service caused cracked heads on my truck valparaiso, Indiana

i took my dodge ram to walmart for an oil change and they talked me into a fuel injection cleaning special for twenty dollars. they said my truck was done and when i got into my truck the check engine light was on. they said that happens sometimes and re-set the code. i left and didnt even get home and the light was back on. i called the auto center and told them and they said bring it back in. i took it in the next day and they said they could not find anything wrong to take it to my mechanic. i took it to a chrysler dealer and they said they could not figure out why the missfire code was on. they changed the spark plugs for a started and reset the codes. i took it to walmart and they gladly paid me back the 240 dollars it cost but there was one problem. the engine light came back on when i left home. i told them and they filed an insurance claim. while i was at walmart, i talked to two other mechanics there and they both said the person that did my work dumps the canister into the intake and it is not supposed to be done like that. i took the truck back to the dealer and they found cracked heads. the insurance adjuster for walmart said the heads were from overheating,HELLO dumped fuel injector cleaner would not do this? he said it was not walmarts fault this happened. now i have to pay for two cracked heads that i feel walmart caused. no problems with my truck at all untill this happened. hope others read this and do not let walmart work on their vechicles. the little guy looses again.