How my weave and iPhone 17 pro max got ****** at virgin active in a locked locker

Hello last week on the 10th I joined Virgin active red in Boksburg and on Wednesday when I went to shower I locked my things in the locker and to my surprise as I apply lotion and preparing I realised my weave and iphone17pro max were missing and the management is doing nothing regarding this. And the lady who works there is the one who said let me call your phone and by the way this is the lady who helps us sign in at the gym every morning and she booked me a class this day. I reported the matter at the police station and the police were not even surprised because they say it’s a normal thing there people always loose their things. Next day I get a strange call from someone claiming to be a police man and that I must unlock my phone and my question is where did this person get my number because my phone is locked and the only person who called my phone is the lady at the gym?? Till now I haven’t gotten any help from the management regarding this matter