If you want Sky to carry out a repair you'll have to call them. The charge would be around £65.
▪️I AM NOT A SKY EMPLOYEE (undercover or otherwise)▪️ Sky customer since 2001 with: Sky Q | Sky Superfast Broadband | Sky Talk | Sky Mobile NOTE: I only provide help on the forums and NOT via PM
If you've only "snipped" the outer covering of the dish to Sky Q box cable, and there is no loss of signal on any of your channels, you could get away with just wrapping insulation tape around it to keep moisture out
