Vodacom network issues - H/H+ modem handshaking

Hi

I have searched through the forums, but couldn't find anything relevant.

I'm noticing that while in midrand, sandton and rosebank (this doesn't happen in cape town), my android devices have connection issues.
Basically what happens is my Note4(N910F LTE) with lollipop and my S4 with lollipop can't successfully connect to H+.
The indicator will sit on H with no data up(tx)/down(rx) arrows, or with H with just the UP(tx) arrow. during this time no data connection is available.
It then switches briefly to H+, and successful data transfer happens for a very brief time (5-10 seconds)

So both of my device struggle with modem handshake to decide on connection speed while in northern joburg area.

I don't know if there are not enough timeslots left on the towers that i am near to or what.

This issue is also impossible to explain to 1st-level support.

Not sure where/how to report it.

EDIT: come to think of it, I haven't seen 4G/LTE on the indicator in quite a long time.