A qualified surveyor should be able to tell you if a fibre line is connected to your home.

Here in the UK at least companies are not allowed to lie about which houses can and cant get service, and there is a regulatory body (ofcom) that regulates this and other telecommunications service aspects.

Just to add (cant edit). They also regulate speed and can receive fines for over promising and under delivering. As a consumer i can raise this with the ombudsman to force action or remediation.