Modem

I currently have 2 modems...I was sent a text by Xfinity Assistant stating:

Hi Denise, it's Xfinity Assistant.
We've identified an issue with your internet equipment at [Edited: Personal Information] that is affecting your Xfinity services. You may be experiencing slower speeds or connection interruptions and your Xfinity Gateway will need to be replaced.

Would you like us to ship you a new gateway at no additional cost?
1 - Ship me a new Xfinity Gateway
2 - No, I'm not interested

Txt help or stop
Msg&DataRatesMayApply

I tried calling and was told I would have to wait 10 min.  So I then was directed to the Xfinity Assistant...to say he was not helpful is a clear understatement.  I would like to resolve this ASAP.  Otherwise my Husband will switch to Verizon.  The one modem we have is white the other black...I assume the black one is outdated and they want to replace that - the CMAC is:  CMAC:  [Edited: "Personal Information"] - the text assistant was confusing and did not help me resolve the issue, I can't speak to a live person so I am left feeling extremely fustrated.  Can someone please contact me or resolve this....:  My account is [Edited: Personal Information].