Were you able to watch the channel before?
Were any other channels having this interfearance?
Did you change any hardware (rogers boxes recently) or change any wiring?
Even disreagardless of the above.. it could be an overall general signal problem. While i agree the people on the phone are not the best, they may be able to confirm a problem in the area already.. and at worse send at tech out.
When i first moved in, it was fine.. and suddenly started with signal issues.. tech came out, added a booster, and its fine.