Max Hospital — Bill not given

Address:

New Delhi, Delhi, 110054

My mom is under going dialysis in max hospital and we are charged for rs 2600/ dialysis
But the bill given to us is 1600rs due to which we are unable to file claim for our medical expense.
The hospital has given the dialysis unit to nephro plus recently and since then we are charged for 2600rs and we get a bill of rs 1600.
Previously we were charged for rs 1600 only
But the excess 1000 rs which they have started charging recently is not on papers and they are not giving us a proper bill which we can file for our medical claim.