Hi Meg - such splits generally generate a new title number and it's those details you are sent by way of confirmation. If you want to query non-receipt of the original title and how that's been amended then use our contact form to query and refer to the original title CYM889903 as well
Public guidance: dealing with land and property - GOV.UK
Alternatively if you need a copy now then it's available online for a fee -
Search for land and property information - GOV.UK