s****** ipad

I bought a meal at McDonald Carlton center because I was not in the right state of mind the staff lady busi took my backs for safe keeping when I started being alert and asked for my property she told me she did not have it. I then ran to the toilet where she followed me and dropped my bags under the toilet I was in when I opened it had no iPad. In the morning I went back to mcds to enquire again where I was told by the same lady that she thinks I was drugged and that she had given me my belongings b4 I left. I have a statement with the center security and the other staff lady who was also present confirmed that the two workers followed me to the toilet. Please advise how to deal with these staff member who clearly has ****** from me. Busi also confirmed she saw my iPad in my bag. My bag was pushed under the toilet cubicle with everything except the ipad