Your phone hardware does not support band 850mhz for 4G LTE. Some Huawei phones with Kirin hardware have this restriction on 850mhz LTE band.
Basically all other networks in Pakistan are on 1800mhz 4G LTE band, it's only Telenor using 850mhz LTE band for Telenor 4G. So it's half Huawei and half Telenor fault.
However, 4G/3G should make no noticeable difference in general basic usage, unless you download stuff, where you will get benefit of significantly faster downloading speeds on 4G.
You cannot use Telenor 4G on your device, but other 4G networks will work perfectly fine on it.