i think my phone is being hijacked (phreaked)

well phone ringed and this automated system for a cable company's billing service was talking when i picked up the fone

it just rang, no 1 called or used the phone within 10 mins of that time

then there were some buttons being pressed and i could hear the tones going...
then i asked who is there
no 1 answered

so i hanged up immediately

no 1 was in the house at that time
just me

later i called Telus (phone company) to ask them about security questions regarding this matter
then suddenly the line got cut or something, it just hanged up and i could hear some clipping sound...

i think there is 80% of chance that my phone is being hijacked and phreaked
so far, phone bill hasnt show any strange things yet for November...

before this, we have had phones ring for once or twice then stops and when we pick up, there is no sound...
it does that about twice a month...

when i finally talked to the Telus again, they said i have to call the service and repair line
then they will do a search or whatever, and if there is nothing, they will charge a fee of $38.50 CAD (canadian)

what should i do???

wait a few more days to confirm if it is really being hacked?