Good morning @Joshpub, welcome to the EE Community!
If you're being sold an additional SIM alongside your contract, we would always expect it to be communicated clearly that this is separate.
If you have any concerns at all about a previous sale, we would recommend reaching out to our customer care team so they can take a closer look into your experience.
When it comes to unlimited data, this is an option we offer on all phones and SIMs, regardless of if it's an upgrade, new connection or additional line.
We do still have a limited range of fixed data options too though.
Peter
