Hi @Suzbean Sky will not call you following a post on this user forum and even if they read your post they wouldn't know who you are.
I had something similar on a Glass TV a couple of years ago. A normal reboot didn't help so I left the TV unplugged from the wall socket overnight and the line disappeared and luckily in my case it never came back.
Give it a try but if it doesn't resolve the issue or if it keeps coming back you should call Sky for additional troubleshooting and if applicable a replacement TV (assuming it is still within its 24 month warranty).
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If my post (or any other) has solved your issue please mark as an "Answer" as it helps others identify the solution
