How do I get Title Deed from Divorced Wife-Owner who disputes agreement ??

I have a simple agreement to purchase a house with $600 monthly payments.The agreement originated with the husband-owner. The agreed upon price "was" $60,000 and in the middle of purchasing, owners divorced and wife got the property. Due to some complications with husband-owner's tax debt, "he" was unable to legally tansfer the property. I agreed to an Aditional $10,00 in monthly $600 payments....since the Wife-owner had no such incumberances. However, upon my making my Last Payment in November 2019....after having paid $70,000....in Monthly $600 payments since August 2012 AND residing in the house this entire time, Wife-Owner wants me to continue paying $600/month (Because they never paid off $10,000 Mortgage...which is WHY I agreed to the extra $10,000....when she told me about the unpaid amount....).and has now tried to evict me. The local JP threw out Eviction because we are not "RENTING - We are BUYING" AND...we have met our obligation of payment of $70,000.00 in full. Problem....I've NEVER bought property before, and the only document I have is a simple signed statement from Husband Owner stating we are purchasing the property fro $60,000 @ $600/month. This statement was written after we had paid about $20,000 and was hoping to get financing and pay off the house early....that is when I was inofrmed Husband-Owner had Federal Tax Judgements against im and HE would be unable to execute the Title Deed Transfer. I DO NOT have an Official Contract nor FULLY Drwan Agreement....Only the signed statement and all th communications with the WIFE-Owner since she took over ownership. ???HELP??