I quite agree that some of the couriers are unscrupulous
I used ParcelHero to send a generator to a customer, should have arrived next day, customer messaged me on the Friday to say generator had not arrived. Tracked it and it was being returned as damaged. When it arrived back, they had run a forklift tyne through the side of the generator. They then wanted to charge an additional £57.50 and were trying to say that the generator had been damaged before dispatch and would not pay for the compensation
Small claims and they then setlled immediately