Sorry to hear about your issue - it is possible the bike was damaged during shipping - the shipping containers used by gasgas have "alot of room for improvement"...
In order to help folks here determine the root cause - you might want to post some pictures. Smaller pictures can be added to posts here - much larger resolution photographs can be uploaded to the photo gallery available here.
Just a quick question - if you look up the chain from the rear - are the countersprocket and rear sprocket in alignment?
jeff
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