Sabarmati Gas — Meter Reading

Day after tomorrow I was out for 1 hr. from home and on that time only your person come to take gas reading for gas bill of may 2022.As my home was closed he put make a bill of 5 unit. Now I am going to pay that 5 unit bill but my question is that will I get this 5 unit minus in my next bill. Because previously also you have charged that minimum 5 unit and in next bill too in had paid that extra 5 unit charge. So please clarify me that you m which basis you are charging that extra 5 unit rupee from a middle class man.
I request pls improve your service. In future we can do self generate gas bill at our home.