So we check in for a one night stay at The Westin ...

So we check in for a one night stay at The Westin Dragonara resort, which was paid on booking. The receptionist (Dusan) confirmed that the full amount was paid. He also added that a 200 deposit is needed. They said this was a normal procedure for every guest on check in but this was never disclosed to us before, even though the stay was already paid on booking. That night we spoke to another receptionist (Jacques) about the issue and he agreed that the deposit will be received back on check out instead of 4 days after check out.
On checking out, 2 receptionists (Jelena Premovic and Ryan Spiteri) let us know there is an additional payment of 70. I explained that on check in, the receptionist confirmed that the stay was already fully paid on booking. They claimed that the extra charge is because there were 2 'extra' people in the room (which was written in small print in the confirmation email AFTER I booked), but on booking I clearly stated that the room was for 4 people. Jelena was very rude to us and left for a 'meeting', only to return a few minutes later. The director of sales and marketing (Edward Bonello) was involved and later informed me by email that 'the wrong bill was shown and it should have never been disclosed with me.' The 70 were refunded, quoting 'as a gesture of goodwill.'
I find this very unprofessional from a 5 star hotel. These miscommunications can be easily handled by communicating clearly with your guests beforehand.