There are quite a few ways to contact the ESET customer service team. The easiest way to contact them is to phone their main office, so you can get your question answered quickly. The phone number is +01202 405 405.
There are also several email addresses depending on the nature of your query and dedicated tech support. Email at ahref="mailto:customerservices@eset.co.uk"customerservices@eset.co.uk.