You may have purchased a 2019 model. If you bought it directly from Apple, please contact AppleCare and request to exchange the model for a 2020 model. When buying a 21.5" model it is critical that if you want good performance to NOT buy based on priced but on specifications you need for the type of work you are doing. As the RAM is not user upgradeable buy with 32GB of RAM and then also buy the largest capacity SSD you can afford.
If you bought the computer from an Apple reseller then you need to contact that reseller.
To reach AppleCare, please use the following link to find the number that services Luxembourg. AppleCare contact Information