The Bride's Family Failed To Keep Their Promise After Engagement

We were approached by one of our relatives with a marriage proposal for my elder son, who is working overseas. We denied the match at first as the girl did not have the desired qualifications we were looking for our son. We told them that we were looking for someone who has completed post-graduation and is willing to work. The bride's family told us (via the common relative who brought the marriage proposal to us) that they are ready to support their daughter for higher education overseas after marriage and also that she will work after education. As they were willing to support their daughter's education, we went ahead with the marriage proposal with the following conditions: 1) The girl MUST complete her higher education overseas - As they Promised 2) The girl MUST work after her education at least for a couple of years - As they promised 3) The girl MUST complete her English test, which is required in order to obtain a visa to go overseas after marriage, BEFORE the engagement. The bride attempted the English exam twice but was not able to clear it. So we asked the bride's family if she can complete it or if we shall postpone the engagement. The bride's family promised that they will make sure that the bride clears the exam by the 2nd week of December, so we went ahead with the engagement. It's Jan 2020 and the bride has not yet cleared the exam. Before the engagement, the bride said that she is interested in higher education and is willing to work. After the engagement, she is saying that she does not like to study and she has no interest in pursuing education or working. Based on all these, as the bride is not interested in education and as she was not able to clear the English exam yet, we decided to cancel the marriage proposal and conveyed the same to the bride's family. How can we defend ourselves if the bride's family takes legal action on us? WE HAVE VIDEO AND AUDIO RECORDINGS of most of the conversations between the bride's family members confirming our side of the story and proving that the bride's family is wrong.