Virtuemart amount after discount

[jemei]

Hey !
My English is not great.
I want to set VM2 in the benefits but do not want the truth. . For example, the following discounts would be needed :

7500 from HUF 15,000 to HUF 10%
15000-30000 15%

and so on.
I tried the coupon thing but does not draw the invoice . The order confirmation of prints that 10% coupon code but does not deduct from the total .
This plugin also tried VM based on order Discount Amount
As if it did not exist .
We have a customer group who receive a fixed amount %, after all , I am setting the pricing and taxation rules which work well and beautifully.
But it does not really work off the track .

Someone might idea?

Thank you,
Jemei