You can't text someone you haven't received a call from... and not everybody calls from a mobile phone, a lot of businesses still use land lines. I often get my parents or friends to make calls for me, but I don't get them to call back every number, especially when they don't leave a voice mail.
I have nothing to be sorry for, I initially went into the office when they took over the property from the old real estate agent to explain to them I'm deaf and cannot hear on the phone. Instead, I was met with rudeness and brushed aside despite the fact I'd taken the time and effort to walk into the office instead of phoning or emailing. He can stick it in his pipe and smoke it, then apologise to me. I have no problem moving out and letting him find more unemployed dredge like my neighbors to move in and pay less than what I do currently.
instead of letting these feelings build up and going to the effort of moving out, why not just try to be friendly with them? If you give in then they will change their attitudes too.