I thought so. Quote was from Landrover dealership. Do you think spring replacement could have caused damage??

Hi My landrover freelander 2 (50, 000 miles) has just failed it's MOT on O/S/F Lower Arm Ball Joint split/leaking grease and osf strut mount worn I've been quoted £800+ to fix this which seems exorbitant, am i right??? A few weeks ago the OSF spring broke and I don't think the garage who...