What can I do about these people (besides getting another number) ?

[951-Riverside]

According to computerconsulting.ca they belong to an opnion research company in Canada, they call me almost every day and sometimes multiple times a day whenever I answer the phone they just hang up and I'm getting sick of it.

Here are my phone logs for this company:

From: [phone] Today 11:36 AM
From: [phone] Yesterday 11:51 AM
From: [phone] Fri 8/11/06 10:20 AM
From: [phone] Wed 8/9/06 09:32 AM
From: [phone] Wed 8/9/06 06:54 AM
From: [phone] Tue 8/8/06 10:06 AM
From: [phone] Tue 8/8/06 08:12 AM
From: [phone] Mon 8/7/06 01:33 PM
From: [phone] Mon 8/7/06 11:51 AM
From: [phone] Mon 8/7/06 10:32 AM
From: [phone] Mon 8/7/06 08:20 AM
From: [phone] Fri 8/4/06 08:44 AM
From: [phone] Mon 7/31/06 01:21 PM
From: [phone] Mon 7/31/06 11:03 AM

[China_cat]

1. Call blocking might be worth investing in.