left no message. just calls, hangs up

This phone number belongs to iYogi a computer technician support company.  They are crooked.  I signed up for their service and paid for a year of service.  I used them two times and was not happy with the results I received.  I cancelled the contract within a 6 month period.  They have been calling me because they wanted me to pay for a second year which I refused.  They in turn kept my credit card number and tried to get payment again for a second year.  The credit card company contacted me and I had to have the card number changed and a notation on the card that under no surcomstances where they to pay them.  They have been harassing me for over two years.

This number (caller ID) called and left no message when answering came on.  They called back several hours later. Seeing the same number again I decided to answer.  No one answered.  They hung up.

Just got a call from 207 946 0000 guy could barely speak English he said he was calling to let me know about a financial service person in my area that is helping people save money on taxes.  I told him that I'm on the Canadian do not call list and he said he was OK to call me because he is "Prospecting"  and not selling.

i was called from uk with this nomber today