Hello everyone I have a problem, can anyone help?

I used to have a legacy blockchain.info wallet which had BTC in there.

I used 17 word phrase to restore my password to this account after blockchain was updated to the new wallet.

Upon logging into my account blockchain moved my funds into a new wallet but this new wallet doesnt contain my BCH.

I have asked support any they say they cannot get access to the old account.  So tell me how they were able to transfer the BTC from one wallet to the other?

I can still see the BCH in the old legacy address for blockchain but when I log into the account and look at archived addresses this address is not here.

They swept the BTC funds from there into the new one, but did not transfer my BCH.

Any ideas?