You should be called whatever your personal preference is. I just don't like the informality of first names in business communications, call centres etc. If they ask, can I call you .... I refuse, it is best that I feel comfortable during the interaction. If others are happy to be called by their first name that is fine for them. I had a university lecturer who was all "call me Tom", and I couldn't do that either. To pay me back, my children all transferred to a new secondary school when we relocated in the '70's, to an excellent comp with no uniform and teachers addressed by first names!