bad service theft and bad attitude

I gave my big boy gpr 200 in for the valves to be set on the 15 Dec 2014 and after numiris phone calss and visits I. Decided to fetch my bike in March 2015 just to discover that my bike was stripped and my parts was used on other bikes I have photos to proof this. After numirus discussions with Ian the owner who promise to perplace the parts which he did not do up till now I put a complaint in by Jonway and Martie from Jonway promised they wil help me. She phined me to tell me I can go and pick up the spares last night I went there and still no spares Ian promised he will replace the parts on his account it is now 5 months and no joy please help