complaint regarding staff at clicks

I am very unhappy with the way they treat there clients making them feel unwelcome and they invade your privacy regarding medication I did ask if there is a limit to buying any medication they said no but the staff members keeps asking me why do I buy this a lot etc I don't need to explain myself to anyone!!!!!!!!!!! Please take this under consideration it is nobody's problem if I buy a lot or not it is mine they must stick to there jobs and leave the clients alone clicks is going to lose bussiness