Stolen Reported stolen Ghost Slamr

I posted my bike on marketplace Facebook and a guy said he wanted to buy it so I told him it was at the pawn shop because I needed money to go to work he came in said the bike was his and was stolen a week ago and tried to get the worker there to give it to him for what I owed . This is a bullshit storey I bought the bike about a year ago but didn't register it because its always locked up or in my house . So I registered it so I could pawn it to get myself some gas and food money for work. He said he reported it stolen over a week ago now if that was true why did nothing come up when I registered it. So I knew he was lying its all on video at cash canada 107ave and 123st the 2 employees also witnessed what happened . So he said ill pay the pawn cost as piece of mind that he wasn't a thief and after he paid 520 the bike was released to me because its mine and as,soon as we walked out the door he grabbed the bike and wouldn't let go we agree opon 1200 cash which was,less then what I paid but I was sick of his constant getting in my face so he said he would give me 600 and I would give him the bike then he grabbed the bike and pulled it out of my hand and started pedal ing a Ross 107 Ave and I couldn't catch him but he rode a down 123 st towards 108 and I told the guys at cash canada he ripped me off so expect a officer to come for the footage where this can all be proven i bought the bike off kijiji over a year ago so i had a recipt from the original owner but we have moved so many times i cannot find it but like I said I registered it a couple days ago just in case I had to pawn it for gas money