A family member is working as a professional cleaner for a company specialising in cleaning contracts in retail. He works "remote" in as much as he is the only cleaner on site. His contact with his manager is via SMS and phone.
Recently his relationship with his manager has deteriorated, however now we are unable to contact his manager (specifically at the moment to request holiday and ask about possible discrepancies with pay and holiday allowance). He won't answer or return calls, and has on one occasion hung up (we called from a phone he wouldn't recognise and he hung up as soon as we said who was calling). All attempts have been made during reasonable office hours.
We've so far been unable to contact his boss' boss, either.
We're getting to the point now where I believe he should leave his job, and would have a reasonable case for "constructive" dismissal.
In general are there any sort of regulations that one should be able to always contact a manager, regardless of the relationship?