Damaged my engine and body work and poor workmanship

Took my running car in for a tune up and injector upgrade and after more than 2 months month of it being there(having initially been told it’ll take less than a week), they had only managed to damage the engine( broke the lifters in the head) and put huge dents in the fender and big scratches in the body work and damaged my dashboard. The bonnet did not even close properly anymore and they simply made 50mm spacers to go under the bonnet and told me that’s how it is now. in the end I had to have the car collected by another mechanic and have the motor and body repaired at great cost to me. Poor service. Little to no communication and very poor workmanship . This workshop gives the aftermarket upgrade industry a bad name