I thought the duty tariff on software was 2.6%?
What issue are you having? if you can advise what you are importing and from which country I can have a look into it for you.
I have a similar issue, we resell software and support licences which we buy from the Czech Republic, I cannot seem to find any references to software as it s a virtual product.
Customs tariffs refer to physical goods. For software, you thus need to refer to the physical good that contains the software (e.g. DVDs), which are usually dutiable at a zero rate.