Hurt and Disappointed

On the 27th of September two of my friends and I went to Mugg and Bean at the V&A waterfront,placed our orders and waited for our food. Whilst waiting the waiter comes back to collect the menu’s without noticing my phone which was a Samsung Galaxy Note 5 was in the Menu , as we were about to make calculations We start looking for my phone we couldn’t find it, call the waiter ask about the phone he denied knowing where it was, at this point the phone is switched off it goes straight to voicemail, we call the Manger on Duty she tells me there is nothing she can do as she’s the only one working and can only look at the Camera’s tomorrow morning, than promised to call me back on my husband’s phone no matter the outcome, she escalates the matter to her GM Eddie, still no feedback I than called the Sunday to find out the outcome, they tell me they can’t view the Camera’s as they need to call Technician to fix them however they can only view as far as 3 days back, I called Eddie again about the footage and they told me there is nothing they can do because they don’t take responsibility for customers belongings. Till this day I don’t have my phone and they refused to show me the footage. I don’t know what to do now because I bought that phone cash last year for 14 000 and they treat me like this. They showed no sympathy whatsoever and I’m just supposed to accept that my phone is gone.