Conversion certificate problem with immigration

Hello, my name is Michele and I am hoping for some help... I am in Canada (caadian citizen) and my husband is in India (indian citizen). I have been in the process of sponsoring him since march 2017 for him to settle in Canada with me. On december 19 2017, we were suppose to get married according to the special marriage act of 1954 in mumbai, maharashtra. However, my flight was delayed followed by misunderstandings with the lawyer arranging for the proper documentation (he thought I was hindu but I was christian at the time). So on December 20 2017, I converted to hinduism by meeting with a hindu priest in Mumbai. From this I obtained an affidavit stating the priest had converted me and that my new name was ''Michele'' (I kept the same original name for legal purposes). On december 29 2017, my husband and I went to the same temple and we got married in the presence of his family and friends. The next day we registered the marriage and obtained our marriage certificate shortly after. Following the spousal interview with Immigration Canada, they asked for proof of my conversion to Hinudism. We sent them the affidavit. Two weeks later they wanted a specific certificate of conversion. My husband started contacting numerous lawyers in Mumbai who said there is no such thing. Even the municipal registrar office where our marriage was registered said there is no such thing. My question is that has anyone ever heard of such a thing and is it applicable to maharastra? If so, how do I obtain the certificate? Any help will be of immense appreciation...