Jaguar — Geyser 40 liter Jaguar

Dear Team,
I was also compliant early regarding this but my problem remain same till now. I buy a jaguar geyser on 06-dec-20 Invoice no 2632.
But hot water pressure is just like in drop if you want to fill a bucket it will take hours to fill a normal bucket. So please resolve my problem as soon as possible.
Water Tank height is more geyser fitted on 1st floor and water tank in on 2nd floor terrace.
Compliant no -0052.8676