Bad service

I had store credit on my disxhem app. And someone hacked into the profile and purchased a gift card for the entire amount. I contact the details customer service 2 days in a row. They told me to change my password and get back to me. I decided to go in store 2 days later and they called the customer service again. Today they contacted me and informed me that I will not be able to get a refund for that amount and I must keep a more strong password.