You have bought, installed, activated the modules. You have required and got our support in the support in the past. After a certain time you contacted us saying:
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"dear anthon

i've bought this module about 2 mounts ago

but it didn't useful for me and i did not use it .
Is it possible to change this to your another products?

regards"
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Well...

1) My name is not see more Anthon
2) you have activated and used the products in your site. No refund or products exchange is possible just because you will not use them still.

I too would like to go to the guy who sold me the car for him to say:
since I will not use more than my car bought 4 months ago, I come back the money?
Otherwise you can change me the car with another?
Do not understand why so many people on the internet think they can ask anything.