It was wildly popular when it rolled out at the end of September. But three and a half months later -- there are serious concerns that Canada's do not call list is being abused.

Sue Wallis is fed up with telemarketing calls. She thought registering on the national Do Not Call List would make things better. Sue says it's done the opposite. From one call every week or two, she's now getting up to four per day

"Now it can start at eight o'clock in the morning and go to nine o'clock at night," she complained.

Sue has received calls on her cell phone too. It's a complaint we've heard from other viewers who say they never received telemarketing calls to their cell phones until they signed up with the Do Not Call List. They suspect the list is being misused.

"Right now we have more than 500 investigations on the go," admitted Lynn Fancy with the CRTC which oversees Canada's Do Not Call List.

Fancy said an investigation can represent hundreds or even thousands of individual complaints.

"All telemarketers must follow the national Do Not Call List rules and we will be investigating the complaints and taking the appropriate actions," she said.

"Yes they should investigate it but again what are they going to do about it?" asked Sue. "What can they do about it."

The CRTC can issue fines of $1,500 to $15,000 per infraction. And it doesn't have much patience with violators.

"We may issue warning letters to a telemarketer and in that case we give them a very limited period of time to meet our standards meet what are the rules and they must comply," she advised.

You can help the CRTC investigations by making note of the name of the company or individual calling, the phone number and any other information you can gather and then forwarding it on.

Sue suspects telemarketers from outside the country have obtained the list and are using it -- not as a do not call list -- but as a call list.

"They've got to tighten up the rules on it, they've got to do something," insisted Sue.

And while the government says it's heard from thousands of consumers who are happy with the Do Not Call List -- Sue isn't one of them.

"I wish I had never registered. If I had known I would get inundated I would never have registered," she concluded.

With a report from CTV's British Columbia's Chris Olsen.