No WiFi in one bedroom, signal drops intermittently

[PASK]

Just signed up to Sky WiFi Max broadband in a small 3-bed semi-detached house, but the signal in one bedroom is poor & keeps dropping off. I've purchased a tp-link Wi-Fi range Extender but this makes no difference. Is there something better I can get to sort this? Amd, would a neighbours Sky broadband interfere with mine?

Thank you.

[TimmyBGood]

@PASK 

Sky loans wireless booster hardware free under the terms of the 'WiFi Guarantee' element of 'Broadband Boost' and the 'Enhanced Wall to Wall WiFi Guarantee' part of the 'WiFi Max' subscription supplement: they don't otherwise provide or sell them except to resolve issues with Sky Q. Phoning Sky to go through a telephone diagnosis is required to have a booster or pod allocated to the account. Inevitably some have leaked onto a certain auction site, but Sky won't offer support with using these. 

Confusingly the 'Wall to Wall WiFi Guarantee' doesn't actually provide booster hardware, and is essentially a sales lead generator for the supplements mentioned above.