Harassing Mentally Even After Divorce

I have being divorced almost past 7 months and it was a contested one but however my wife didnt appear before the court at the time of the proceedings .but now after 7 months she is insisting me to marry her again and she is mentally harassing me by calling 300 to 400 times a day...there was a lot of drama and stress which led to this...and I dont want to engage in this nuisance again...she didnt appear before the court by her choice and was also.ok with it but now I dont know what she wants....and is threatening me that she would appear now and drag me again.....pls suggest what should I do ? Can I lodge a complaint regarding this harassing situation?