The Corporate Culture in our country is totally f=different from abroad. They have to say Sir! and Please Sir... etc. Manager can ask you to get his lunch from home as well. Where I work in US, they have positions for internal tranfers where one may switch from under one manager to another. That Manager may call you ex manager to check on your performance. BUT I am not aware of people applying to some other Company and while they are still at work here, without resigning, will let the company call and check. I would say the Manger will not be much pleased.
People always, quietly do the interview, get the offer letter ..then they inform with a resignation letter.
In the above situation I would go to Master Tiles and press them for ruining my job.