I'm getting full Signal bars but no 3G/4G/LTE

Hey everyone. So I recently upgraded from a Sony Z2 to a new gold Galaxy s7 flat. So I recently bought it new from a retailer known as Vodacom (Vodafone) in South Africa. I was asking the guy working there if the phone is sim unlocked and he said 'Yes.' Well i did have a few vodacom phones before, working with other carrier sims overseas, so i trusted him and bought the phone. I live in New Zealand and I was on a flight to nz the same day that i bought the phone (Because in South Africa the s7 is much cheaper + you get a free Galaxy tab 3 lite witht the deal). So when i arrived in nz, i got me a Vodafone (Not vodacom) sim card and inserted it ito the phone. I got full signal bars but no 3g or 4g or internet in general. When i booted the phone up, it didn't ask for a network code or anything, and the Vodafone SIM app did suddenly appear on my phone, so I have no idea what's really wrong with this thing. My mobile data is on and limit are all off. Please help me! Regards

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