Where did Jannie say that?
I can't tell you now where, but I can remind you what.
JvZ wrote in context of network disruptions by Vodacom that they were aware that Cell C roaming agreement with Vodacom was defective, but it was not their problem, they just complied with the agreement.
I wrote already on the forum explanation for a typical problem "Full signal - no data throughput" which was observed in areas with strong Vodacom signal.
Here it is:
Some Vodacom towers allowed registering Cell C users to their 3G services. I think it was in purpose to off-load their 2G voice traffic and convey it using 3G CS services, but it was very selfish approach, as there was no roaming aggreement for Vodacom 3G PS services (data) and modem firmware was confused by being able to register to the Vodacom 3G tower, but subsequently was unable to open data channels. JvZ arrogant reply was giving me a clue that it could be even made deliberately, so started investigate it using AT commands. When I received modem which reported back active freqquency channels, I discovered that modem was locked to the Vodacom frequency band, but was still reporting Cell C Cell ID as an active cell. It was evident to me that modem was in the process of handover, but didn't complete this process being stuck in this stage. For the user the modem was still indicating connection to Cell C network, but in fact it was already hanging on the Vodacom tower which didn't give any throughput.
Fact of allowing to register to Vodacom 3G tower has been confirmed by many users. JvZ was aware that such practice could disrupt Cell C network, but didn't give explanation why they allowed to do it.