Give me some guidelines/tips for Dawah. I want to call people following Jamaat-e-tableegh (more than 95% of Muslims of India are following this Jamaat, but calling themselves as Hanafees) to true Islam i.e., to follow Sunnah of the Prophet SAWS based on saheeh ahadeeth. These people doesn't know what saheeh hadeeth is. They say all ahadeeth are saheeh. They read and follow only one book "Fazail-e-A'mal". If in some issue they do something wrong and even though we quote saheeh hadeeth before them they do not accept it. They hate people of AHLUL HADEETH. Their dawah is to call people to tour 1day or 3days or 10days or 4 days with them so that they can learn about Islam. But actually they have no knowledge about hadeeth. Tell me how should I try my best in calling them to true Islam?

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

"al-Tableegh group" is one among the Muslim groups that work in the field of Da'wah. This group has demonstrated a good influence in guiding people to the truth and serving the teachings of Islam although there are some errors, as you mentioned in your question, in their way of Da'wah.
Thus, a Muslim is strongly advised to co-operate with this group in good and piety. Also, he is required to advise them individually to the truth in kindness and wisdom and to choose the appropriate time and person, who is bias-free. At the same time, there is no harm to invite some persons of them if possible. Then, show them that your goal is to follow the truth and guidance and that you are doing this for the sake of Allah and due to loving them as Muslim brothers. At first, you have to avoid discussing sensitive issues with them. You have to invite them step-by-step.
In the same vein, we advise you to seek advice from good scholars in your country and to avoid making decisions in a hurry since such things may harm Da'wah and its faithful followers.
In addition, we draw your attention to spread your Da'wah activities to the Muslim society in general and do not limit your activities to this group. Since enemies of Allah do their best to fight Islam and destroy creed and morals of Muslims.
Allah knows best.