Is my Nikah still valid after I said “talaq” more than once?

Because of a misunderstanding and argument, my wife repeatedly slapped me twice. I went down, spoke to her mother, and asked her help in calming her down. On receiving no response from her mother, I went back to my room. My wife followed me to the room and demanded for talaq. Since I had exhausted all options and with an intension to give warning, I said, “I will give you a talaq? Then repeated the words talaq more than a couple of times. In this case, did talaq happen? I further stated to her that this is the first; I need to give you two more times at different instances. Next day, the elders of her family came and asked me what I said. I explained to them what I said; they then claimed to me that they are witness to the divorce and now the divorce is complete. They asked me that I should write it on paper that I am giving divorce to my wife Suboohi and sign it. I refused. The iddah period is over. Her family is claiming I agreed for divorce. Please answer me as soon as possible, because my mind is thinking about the validity of my Nikah.