If you have done all the online troubleshooting like running the line tests then the next step is to call Sky.
150 is the free number to use from a phone that has a Sky mobile sim in it or Sky Talk phone otherwise under "Need more help ?" link at the bottom of the page on this link is the number to call Sky on:
https://www.sky.com/help/home
Try saying nothing when spoken to by the bot.
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