Security in my personal belongings

I have a question and need advice.... it's something very frustrating to me... at all PEP Stores security at the door request to see your bag ..I don't have a problem with that, what angers me when they dig deep into my personal belongings in my bag with their hands, i feel violated into my personal belongings...touching my personal items, where can I complain about this , is this allowed per the law? this frustrates me as if my personal belongings and space has been invaded... Kindly advice where and how to complain...because according to the security it's PEP Stores laws....😡