@Ksangha that's ridiculous and esp if they can't do anything to fix it! Have you tried directly calling the scanning dept maybe they can put you on a list for cancellations?
You can still have the quad test which only tests for t21 but also if there's likely anything else up they'll be able to see signs on the scan by 15 weeks so I don't think it should be too much of an issue, and hopefully all will be well anyway , also I know a few private places will do the NT measurements for you if you wanted that?
I'd be completely p'd off about that though!
On another note one of my pals was going to her 12 week scan but got there and was actually 20 weeks pregnant! So couldn't do anything about testing etc but baby was totally fine! 🤞🤞