Unknown charge

Hi guys!
I am from Europe, Greece and yesterday i was charged for unknown reason by Avast. Does anyone know how I can contact with the company, preferably by email? I have tried many times but I didn t find any contact form, only a phone number probably for American citizens, in which I have no access from my country.
Thank you very much for your help in advance!

You can call this +1‑844‑973‑3072 toll free numbers and explain your situation to see if it helps in resolving the problem. Also, if you want to connect via email then contact them at support@avast.com. I hope this helps in getting the refund.