Stop unsolicited calls

I registered my mobile phone with the Do Not Call register several years ago. For some time, it helped to stop the unsolicited marketing calls.
During the past two years, I keep getting the unwanted calls. Initially, they came from overseas numbers. Later, I get the calls from local numbers, including personal mobile phones.

I took this initiative to stop the unsolicited calls.
http://tklcloud.com/Feedback/feedback2.aspx?id=959