Ownership of the Flat and Bank

Me and my husband owned a flat. We took SBI Home Loan. Due some personal issues I am staying seperately with my 2 daughters, 25 and 23 years old. In October, 2021 our home loan was cleared and I wrote email to SBI bank that already bank is having all papers related our flat, so to handover the documents to education loan department for my daughter education loan. Already me and my husband signed EL documents and gave to the agent. At that time , my agent told that my husband has already taken papers from the bank(bank has handover the documents without knowing me or without asking him to bring coapplicant with him) So I wrote seperate email to bank asking my property documents. I received email from that i should collect it from bank (so in there system it was not updated that one applicant has already taken the documents). I also visited branch, where I came to know that my husband being nationalised bank employee, SBI staff member gave documents to him without asking for coapplicant..at the same time his boss told me that it's bank policy to handover documents to both the applicants and take ther signature On the other hand, my husband who had taken personal loan (i was not aware of this) from one of the loan lender...gave all property documents to him and also they made some papers where he has mentioned that he has sold his 50% ownership of flat to that person (he is not sharing the documents with me). I am writing regular email to SBI to give justice to me and return my papers. Now this person is insisting me to sell the property and from the amount he will deduct the loan amount and will give balance amount to me. Or second option he gave is that i should give him the loan amount and purchase 50% from him Since 4 years, i am not staying with my husband. I don't have any connection with the loan he took from him. Why should I repay the loan or why I should sell my property? What should I do now?