This is a unique case so I took some time to look into it.

It would appear that the "merit abuse" part has to do with these 4 accounts:

steve_rogers (banned)
timoshani
nastyabor (banned)
dimplit (banned)

sending a total of 10 merit to this account:

AsrRustam (banned)

Here is what the sent merit network looks like:



Its impossible for me to tell whether the posts you merited were of any value because they are all deleted.
I know merits are for the most part subjective, so you will need explicit comment from theymos or else whoever did the banning in order to know more.