No you don’t get paid you just get disciplined
""If it's too high I'm going to assume so, I think as long as you tell someone it's low on money you should be fine""
Why do people think it's OK to 'assume' an answer without actually knowing one! The fact that this person thinks that you 'tell someone' is ridiculous, and they've obviously never worked a till in their life. The till is cashed up by management who can print off a reconciliation report so they know exactly what the balance of the till should be. They will then know if a till is short or over, and will take appropriate action if necessary - that's not an 'assumption', that's fact, as I have been on a till, and also on management.
They were not helpful as they protested and spiteful.