You'll need a technician. Although it looks like (and in principle is) a simple coaxial cable, the nature of DOCSIS means that it is VASTLY more finicky than (say) a digital terrestrial TV feed, so doing a DIY cable repair (incidentally against the T&Cs you've agreed to) has a high chance of causing problems either for you or your neighbours.
You can try dialling it in, but may struggle to get through, but if you wait the forum staff will pick up your post and advise on what can be done.
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