BINGO!
Based on lengthy research, I found out that calling them on the phone is NOT an option at all.
Was told that paying in full can have bad results as well because they might report it as "paid in full" to the CRA, which won't look that pretty either.
Was advised to send them a letter requesting them to validate the debt, thereby stopping them from taking any further action until they validate my debt and that they're allowed to collect it.
In the meantime, I would try to pay ConEdison directly so they won't be able to validate anything..
Their letter was dated 10/2 but I only received it about 10/7 or 10/8.
I mailed my letter back to them yesterday, and it still hasn't gone out due to the hurricane the post office is backed up.
Does anyone know if this still counts as within 30 days of receiving their notice? Or are my 30 days up on 11/2 (today) since their letter is dated on the 2nd as well, although I got it about 5 days later?