Poor support on fibre fault-finding

We have Afrihost fibre installed and have daily intermittent connectivity. When it is connected it runs at full speed but will suddenly loose connectivity and then nothing. After about two minutes it will connect again and so it goes every day. We grew now tired to resolve the issue and we just get told 6 there is nothing wrong and we need to get this sorted out with Openserve as they provide the infrastructure. This type of service is really unacceptable.