Language Barrier

I couple who are friends of my parents are visiting their son and daughter-in-law in the US. The gentleman was kind enough to mail me a present for J that my parents had sent with him. One would imagine, it would be a fairly simple matter for me to call him and say thank you. I called the number from which he had called me when he first reached here and it was answered by a young woman with a distinct Bengali accent. Without further ado, I introduced myself in Bengali. Clearly, that was a very dumb move. The woman was grievously offended and asked "What did you say ?" in a decidedly rude tone of voice. I figured this was the daughter-in-law. Duly chastised, I reintroduced myself and in English this time and hoped for the best. At this point, the woman said "I don't know who you are" and hung up on me.

She had not allowed me the opportunity to say that I was looking to speak to her father-in-law Mr D. There is no other way I know to reach him now. He won't know that I had try to reach him.I tossed out the package in which J's gift was mailed so I don't have a postal address to mail him a thank you note. He does not have an email address. So here I am stuck with an unsaid thank you like a fish bone in my throat. It is hard to speculate what the relationship dynamics are between the woman and her in-laws but as an outsider I am stuck coming across as uncultured and ungrateful. I can't help thinking that I may have fared better if I had not launched into a conversation in Bengali - that may have been my undoing and it's too late to make amends.