@Romina2 you sre not talking to Sky by posting in the forum if you want their help call them. However one of the most common issue with WiFi boosters/extenders is placing them in the wrong place. As these units need a strong connection back to the hub try them no more than halfway between the hub and where you need the boost. Hallways and landings are often good places to try.
If you cannot get decent coverage call Sky to arrangecfor an enginerr to visit who can agree to up to 2 more extendrers as part of tge WiFi Max bundle. However some properties are really difficult so if your home has solid internal walls you msy need to consider third party options.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
