what's my name?

Everytime I go down to the cafe to get my coffee or hot chocolate, the same girl spells my name wrong. Once I even spelt my name letter-by-letter but there was still a fail. My colleagues call me 'Antha' now. When they are trying to get my attention, they say 'Antha Antha Antha' really quickly, as if they were a bunch of toddlers. Wonderful.