my hid lights wont level?

hello all

i recently put a set of hid lights on my car 6000k pure white
i had them prefessionally levelled at a mot centre now they look miles to high and people flash me all the time i bought them to make my viewing better not to blind other road users i took them back to the garage and he said they are fine and would pass an mot
but when i pulled up the other day i could see one was higher than the other which aint right
i tried to level them up together but it seems it keeps falling out of please any ideas would be very helpful and i would be really greatfull

happy new year all