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About 99% certain to be a scam: see https://www.consumer.ftc.gov/articles/0346-tech-support-scams.
Comcast sometimes calls when they detect signal quality problems with a modem, gateway, cable box, DVR, or other device directly connected to their coax lines, but never "a problem with your computer" AFAIK.
Hi shirlk4, I can confirm with what BruceW said and we wouldn't call to fix your computer. If you would like I can check the notes on your account to see if there is anything there with an explanation. Please send me a private message with your account information (name on account, address and account number).