Customers with Canada's three biggest telecom providers — Rogers, Bell and Telus — say they're frustrated by contracts that lock them into agreements but allow the companies to increase prices at the same time.

In hundreds of emails to Go Public, customers say they're fed up with unexpected increases to their monthly internet, TV and home phone bills during their contracts.

They started writing after CBC News reported the story of Cathy Cooper, a Rogers Communications customer in Sidney, B.C., who was caught off guard when the company jacked up the monthly price of renting TV boxes by $7 apiece ($12 each for newer customers).