Ubook Xpro on off volume switch

Τhe on off and volume switch my Ubook Xpro is broken, maybe it was problematic from the beginning, unfortunately I didn’t notice it sooner
The machine was bought from a original CHUWI STORE store@chuwi.com two months ago
I don’t know if there is a guarantee one year ? and where to turn
I wonder where I will find a replacement for it.
I have the replacement expertise
I have found a website that sells it at an exorbitant price of 84 euros with shipping so very expensive
I have warranty papers but it doesn’t say an address or on line activation procedures


Contact service@chuwi.com for support and activate warranty.