A pokiaľ by to nešlo "okľukou" - skús to priamo na výrobcu - https://eu.aoc.com/en/service-contact.
Sami píšu: https://eu.aoc.com/en/warranty

We stand behind the quality of every monitor with a generous 3 years warranty. Within the warranty period, any AOC displays with manufacturing defects or faulty components will be repaired or replaced at no additional charge. In case of a missing proof of purchase (POP), the warranty period is considered to have started from the date of manufacturing indicated on the product or from the serial number of the product and will end after 39 months.

Ak nemáš doklad o zakúpení - tak až 39 mesiacov ti započítajú ako záruku.

Niekedy je toto rýchlejšie, ako cez obchod.