Hi Charliecakes,
Welcome to the Community Forums.
I am terribly sorry to hear that our engineer caused damage to your TV aerial cable, this isn't the level of service we expect to provide at all.
I'm going to send you over a PM so I can take some details and look into this for you - I'll contact the Area Field Manager and let them know what's happened, they'll then get in touch with you and discuss how they're going to work towards a resolution with you.
Please look out for my message over at the purple envelope.
Kind regards,
Beth