Mechanic has had my motorcycle for FOUR months and it’s still not finished

(F20)So in early November I brought my bike to this mechanic my BIL recommended me. I knew it needed new tires and a new battery, I paid him $300 upfront and he said it would be done in two weeks so I would still be able to get some riding in before the winter hit. Fast forward to this morning and it’s still not fixed. I rented a U-Haul motorcycle trailer and called him to tell him I’m on the way and he told me I can’t come get my bike today because the tires aren’t on and theres loose bolts and he wants to get it finished. I’m going to try and pick it up tomorrow and if he refuses again I’m going to call the police.