Please note that if your mother was Jewish before you were born, whether observant or not, then by Jewish Law you are also Jewish, and you do not need to convert. Please contact an Orthodox Rabbi for guidance.
When a Gentile wants to become Jewish, the Rabbis are required to try to dissuade him. Only the very sincere make it through the entire process. And the process can take a long while. It may not turn out to be easy
Most Rabbis are not qualified to work with potential converts, and there are some qualified Rabbis who are too busy to do it or are incapable for other reasons. So don't be offended if the Rabbi you call pushes you off with what sounds like an excuse. The excuse may be real.
And when you find a Rabbi that works in conversions, he's not going to make it easy for you, because Jewish Law says he must continue to dissuade you, and he will do so by various means. He may push you off a few times, he may not show up for scheduled meetings; there's no telling what he will do to test your sincerity and perseverance. If you are sincere, don't give up. Keep on politely calling or meeting with the Rabbi, until something happens. The Rabbi is following the Torah's Law, so if you give up you can't blame the Rabbi.
It is important that you understand another fact. If you want to have a proper conversion to Judaism, it must be done through Orthodox Rabbis. By Jewish Law, any conversion done by any other means is invalid. This is no small matter.
Worldwide Orthodox Synagogue Network
The Chabad-Lubavitch Worldwide Directory