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Tel 1 and Tel 2 intermittently lighting up when I only have one phone line

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Tel 1 and Tel 2 intermittently lighting up when I only have one phone line

While I only have ONE phone line, usually lit under Tel 1, I have noticed on 11/21/19 & 12/01/19 that  the Tel 2 line is lit, which should not be when I only have ONE line.  I have read a post where it said Comcast runs reports.  I made a call & the person whom I spoke with told me this is the first time he has heard of this & claimed I will need a new Modem.  I requested a call in the a.m.  When I picked up phone to make this call, I noticed Tel 2 flashing & Tel 1 steady on.  Again, usually only Tel 1 is lit & will flash when in use.  Any concrete answers as to why this is occurring?  Logically it seems like I have 2 phone lines when I only have one.  IF Comcast runs reports why wouldn't those answering questions know this?  Useful information please.  Thank you.