bad service

I bought a Sheena sewing machine in Aug but the machine came after two weeks. The first time I used the machine, the needle couldn't rich the thread on the bobbin case. I phoned the call centre, they told me to fix it at the nearest sewing machine shop. I did, I phoned them again to ask for their fax number in order to send them an invoice, they put me on hold saying they are connecting me with the proper department. Up until today my machine is still not functioning well. I want to cancel this order. Thanks.