If you are disconnected from the internet, it's best to continue answering questions until the connection is restored. This is usually possible because all the exam questions will be loaded at the start of the exam. It's important that your internet connection is restored before the timer runs out, or the answers you provided can't be synced to the server.
If for any reason it is not possible to continue answering questions, it's best to do two things:
Contact Examity and notify them of the problem; Record how much time you have lost, and email us at info@omptest.org after the exam has ended. If you are able to provide proof of the amount of time lost, that will help. We will then look into the situation and offer a suitable solution.