Dont value loyal clients

The service i recieved yesterday from Audi Hatfield was just poor to another level to think i also take my Polo Vivo there at VW hatfield i was just treated like nothing honestly, my A3 2015 had a problem with a washer on the left i called in to tell them on friday they booked the car for monday,, but on my way there i mistakenly used my washer as my windscreen misty due to could and the washer cover fell, when i got to audi they tell me that the handle that holds the cap of the washer is broken and it looks like negligence to my surprise as i have been having the car for more than a year and no negligence has ever happened and i explained to manager Martin who does not even have an ounce of customer service in or should i mention the service advisor who never kept me informed throughout i had to call him? what hurts me is that the washer handle might have genuine broke with no negligence but no one bothered to listen to me but they were quick to quote me R4000 for some that was broke due to faulty, For a loyal customer of hatfield who works for a company like AA and recommend it to clients i am dissapointed and i guess my recommendation of them is done