Window switch debacle

My car has memory seats but no memory switch! All evidence pointed to the wrong drivers switchpack being installed so I found an extremely expensive memory switchpack on eBay UK and ordered it. Well it’s good news and bad news, the switchpack is not 100% – the memory buttons sort of work, in that the mirrors and steering wheel now stay put but not the drivers seat, and I have lost my auto function on the drivers window. Should beep when you press the memory button too. I think I need to buy that broken pack off eBay and rebuild it with parts from one of my switchpacks until I have a 100% unit