It's good that you're sounding the proverbial alarm! I have seen the error message 'waiting' in the configuration of the Watch App more than once on the Community. The solution here is to delete the current request from OneNumber, so that you can then order/activate OneNumber again. Before making the new request, please restart your device and Apple Watch.
Someone from Vodafone will be online again on Monday to watch with you. If you can't wait, visit a Vodafone store again to solve the problem there, together with an employee. But the above should now work because someone from the store has already stopped your OneNumber.