为Driveway的事准备打官司了,但对方不看且退回我certified mail怎么办?!

为Driveway的事准备打官司了,但对方不看且退回我certified mail怎么办?!Wrote and sent the contractor a certified letter reminding him that he had broken his promise however gave him a last chance to finish his job before I resort to a court. .... the contractor returned my certified mail without openning it!_:mad:

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