What is the supplication or Quranic surah that can be recited to facilitate the recovery of rights from someone who refuses to give them, and does reciting Surat Yasin a specific number of times make that easier?

There is no specific supplication or particular surah for facilitating the recovery of rights. However, general, comprehensive supplications have been reported, such as: "O Ever-Living, O Sustainer, by Your mercy I seek assistance; set right all my affairs and do not entrust me to my soul for the blink of an eye," and "O Allah, there is no ease except what You make easy, and You make sorrow easy if You wish." A Muslim can also perform the Prayer of Need (Salat al-Hajah). As for fulfilling needs by reciting Surah Ya-Sin a specific number of times, that is weak.