tv, phone messages & why I was just informed that someone may have gotten my credit card #/

I got hbo yesterday & it never came on the tv but it shows me being charged... I have phone messages that I cant access & I have spent a lot of time trying to get this all sett up....tell me whats going on please/ Thank You, & please call me back, I have several questions & am tired of calling all the time. Sorry to be so blunt but this has all been a big problem for a long time. Thanks again