Honda cb twister
GEAR SHIFT PROBLEM

I RECENTLY BOUGHT A NEW HONDA CB TWISTER ON 9-3. THE BIKE HAD A COMPLAINT OF GEAR SHIFT PROBLEM THEN I REPORTED THIS THE SHOWROOM SERVICE CENTER. THEY CHANGED THE UNWANTED PARTS OF THE BIKE FOR WHICH THEY CHARGED ME.STILL THE PROBLEM WAS NOT RECTIFIED. I ASKED THEM TO REPLACE THE BIKE FOR THE NEW ONE THEY ARE REFUSING. P;LS HELP ME REGARDING THIS