In my personal experience. In a Transaction in Crypto is certainly not refundable. My example is like you did when sending BCH to BTC. It is your personal mistake as you say. It often happens this problem. Usually before you send a coin there is a warning send to the BCH address for example and you send to BTC your BCH auto address will be lost and no one is responsible in this regard. Therefore, before doing the transaction must always be careful. Hopefully you can be patient in this matter.