Call the cable company and complain that your internet isn't working. Ask them when they're going to fix it. Continue calling until service is restored.
In the meantime, you need to mitigate your losses. You can't sue the landlord for your lost $100,000 income if you just sit back and don't do anything. You can get a cellular hotspot. You could rent an office. You could go to work.
Either way, take a copy of your lease to a tenant's rights attorney and see if you have any recourse, or if cutting your cord is sufficient reason to break your lease and move without being having to pay the balance of the rent for the remainder of the lease.
There's a chance the cable company has an easement for the wires, and the landlord did not have the legal right to remove the wires. That still doesn't relieve you of your duty to mitigate damages.