Problem with the warranty on the dipped beam bulbs

Traphatabow 15.7.2022 23:42

Bought a set of dipped beam bulbs in plastic packaging. The warranty is 3 years. Two years have passed and one of the bulbs has blown out. The shop refuses to replace or refund me, as the bulbs need to be fitted by a car service. Since there is no paperwork confirming the installation, no replacement/refund. Is it legal?