Voltas — Inverter ac

Address:

i 9 hakikat nagar saharanpur 247001

Outdoor pcb showing error H5
Already placed a request of changing that defected pcb with a new one
I was ok to pay the bill amount of rupees 6000 approx but all the executives of voltas didnt helped me out
They demanded a bill of my ac but i lost that one
And another bad luck that serial numbers are not visible on my ac !!
Now what to do
I m in a big trouble !!
Voltas i need help!!