Hi Abbey,
Thank you for taking up the case. I have replied to you by email.
The issue is that the hotel provided me with two invoices both for 4-6 May whereas I had two reservations 3-5 & 5-6 May.
I have written to the hotel asking them to re-issue invoices based on actual dates when we stayed there.
I guess lesson learnt for everyone is to make sure dates on invoice accurately match actual stay.