Air Condition Malfunction / Centerlock Malfunction/ Battery Gets Empty

my son golf TSI 2010 air condition not working properly sometimes it works then it stop working same goes to centerlock its on and off in an irregular manner we changed the battery of the car twice in less than a month but the service center in cairo is unable to fix the car this is the second time we complain to your co. but nothing resolved and problem still exist we finally want to get rid of the car and will sell it as soon as it is fixed and will never deal with a vw again