Trai — Repetitive calls received From VI on asking for number portability

I have been using Vodafone mobile network for past 7 years and as I am not at all satisfied with it's service want to port my mobile number with another service provider.
For this I need UPC code which I requested to Vi customer care,
Since that time I received almost 2-3 calls per hour to cancel my port request & availability of other plans for me from VI.
even after repetitive negative response their operators are calling almost 2-3 times per hour and now its almost impossible for me to handle this as I am unable to do my regular work .
All my past bills are settled
This feels like mental torture, So I want to raise a complaint of harassment.

Kindly look into the subject & take necessary actions ASAP