Telcos are eavesdropping. Is this fair?

I know business is bad, but i hope not that bad that the following rumor is true?

These telco/s is/are tapping into the lines at Bitstop Internet Service E1/R2s to find out the numbers of all Bitstop subscribers and Nitro card users. These telco/s then generate a report of that contains all the numbers that dialed up into Bitstop. They then use this to make DSL offers to the people whose numbers are on that list.

Adding insult to injury, the telco people insinuate that the users will be double billed. Once for the telco and another for Bitstop. However, if they decide to switch, they will be billed only once.

Funny that they could say this, when in fact, ISPs are prevented from owning the last mile. I wonder how the public would react to such a scenario? Shades of “hello garci”?