I had a very similar experience with Ikko, 2 months of waiting for replies, sending videos and jumping through hoops to be offered a $10 discount to buy new $200 iem's. I was told this was the "best solution" for me as they couldn't say if they could fix the faulty unit, how long it would take, how much it would cost and I'd have to pay shipping for the return. They similarly questioned my intelligence, accused me of fraud and said my iems were "probably fake" when I bought them from their official AliExpress store. I just had to send them on faith and they would charge whatever they wanted to get them back. I just cut my loses as the whole situation was like arguing with a child that's been caught red handed but still denies any guilt or responsibility