Check by calling 0800 5610061 that there's no reported issues in your area. If there's not, then there's a fault that VM don't know about - which could be your box, your cabling or somewhere else - but you will likely need an engineer visit or replacement box.
TV Faults on 150/0345 4541111 should be your next port of call. You may get lucky with calling through tonight, not sure when they close on Sundays.
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