Khazana Jewellery — scheme and weight fraud

Dear khazana,
Being such a huge competitor in the gold business they are cheating customers in the name sake of schemes which seems to be a pre-planned program which has became an habit for them it seems.
In detail last year 2016-sep:
We purchased a gold in chandanagar branch and the sales person informed me about the rs.1000-/ scheme where he explained that we will get 1000 bonus and 9% off in wastage as well. After the salesperson forced many times i have accepted the same and signed the form and joined the scheme. After reading the application, i asked them about the wastage part which was not mentioned in the application and they said don't worry at the time of closing the scheme we will make sure the wastage percentage will be given to us which didn't happened now where we purchased the gold (In aug17) again after completing the scheme in 11 months. I know there is no proof regarding the wastage but as we trusted them we got cheated as the saying "one can be cheated if they believe". Is this khazana's routine to bluff customer's.
And one more thing is:
Initially they said the valuation and price of the gold will be based on the weight tag. But after the purchase of the item there is difference of weight but they didn't changed the cost of the item.
When i asked them they said that there will be +or - difference which we got the same difference of nearly 12 milligrams.
After a long discussion they reduced the cost in gold but not on the stones. Does the stones not cover under the differentiated weight?
If there is a difference in the weight why they can't fix the cost after the item's original weight.
Please let me know the solution for the same so that we can get some belief.
Thanks for your help in advance.
Sunil kumar