Dont buy a Sony Xperia Z5

I placed an online order for a sony xperia z5 from Vodacom the 15th of January 2016. I received the phone on the 18th of January 2016. The phone cant connect to a wifi network. Apparently its a huge problem since the Lollipop software update. I use a galaxy s6, no problems, the xperia z5. Not worth it at all. I had the phone for a few hours and I want to cancel to contract!! Contacting Vodacom, that doesn't help, they have no idea what im talking about. Please \google"the wifi problem with the z5!! Don't buy the z5 with the lollipop version 5.1.1. I am so disgusted with myself"