Happened to me. I changed my setup to have the c=BTC at the end and a new address worked from the first connect. Then a few days later the abandonned BCH address was changed to BTC automatically (or someone did it but didn't contact me). So in short, try putting c=BTC at the end and also try a different address (I used the same wallet, just generated a new address)
I have c=BTC set but they didnt change the BCH address for me.
When they changed your BCH address to BTC, did the mined coins got there? Because I've been mining all day using c=BTC. Would like to see the profits from that.