Chennai Airport — baggage weight scales at check in counters faulty

Sir. I wish to complain about the baggage weigh scale at the check in desks at the international and domestic airports.
We are British passport holders. travel to Chennai many times every year. and also various destinations.

I strongly believe that the scales at the check in counters for economy class are either DELEBERATELY manupulated and set to 2 kgs per piece more than the actual weight of the bags.or they are all faulty. But how can all desks be faulty. But the desk / counter for economy class passengers are deliberately set 2 kg more per piece especially for the international passengers. They target foreign passport holders and people travelling abroad.

I wish to complain about 2 incidences.
Our family are frequent travellers on Emirates Airlines. Each time we travel. We make sure our baggage is well within the baggage allowance limit both on carry on and checked in baggages. we also check the weight on the scale placed at the entrance before the security scanning in the airport before we proceed to the check in counter. We are very much within the allowance. Many times even a few kilos less than our allowance. But when we reach the check in counter the staff at the counter says we are excess.
On emirates we are are allowed 30 Kg check in and 7 kg carry on. for health reasons we check in 2 pieces and within or less than our allowance. carry on bag 5kg, even though we can carry up to 7 Kg.
They add on upto 2 Kg per piece. Which is a straight 8Kg and 4 Kg and charge us for excess baggage.

They are making good money by unfairly charging us. No one questions it. We passengers are powerless.
In June 2019 my husband who is a heart patient, and I with spondilosis, checked in 4 pieces . when we weighed we were well within the allowance limit and also double checked and confirmed before we came to the checking in counter /desk. At the desk they said we are 8 KG excess @ 2 kgs per piece. They weighed our carry on bag which was 5 Kg and 4 Kg each . They said they were 7 Kg and 6 Kg .Cleverly Giving us no room for shifting some items to the bags to adjust. this is absolutely cheating and lying, FRAUD and making big money. They said all other scales in the airport are faulty and only theirs are correct. Absolute FRAUDS. Unbelievable
We were charged 16000 rupees. They are happy to recieve dollars and pounds.The process for payment was very complicated and stressful and awfully slow.
Last month on 28th Dec 2019 I travelled to Dubai and it was the same story.
Our humble request for ourselves and for all other passengers travelling abroad please Take immediate action and look into this unfair mode of making big money.
The staff trying to earn their Bonus by milking money from passengers and meddling with the weigh scales at the counter.
I am sure this the case in all the airports through out India. People trying to do this SIN full things should be severely punished.
We have not seen this in any other country. Real Sinners.and frauds.