Cutting off data as mobile calls can only be made over 3g network

This is the most bizarre issue that as only been met with an absolute lack of care or willingness to resolve a network based issue. Melon has represented themselves as a modern and new age service provider providing the best in mobile networking, however, on my iPhone 12 Pro Max that has 5G, every time I place or receive a call the 5G network is disconnected, cutting off any data activity (such as browsing or even another data based phone call) switching from Melon to MTN-SA as the network provider and downgrading the network to 3G to place the call.

3G is a completely outdated network band that is being phased out, and I was told by the "support team" at Melon that this is standard practice, however I was with MTN before, and they don't have this issue, nor does Vodacom, Cell-C or Telkom Mobile for that matter. So how can it be a standard practice if Melon is the only network provider doing this? They make use of the MTN network who DON'T have this problem.

Melon has used TikTok and influencers to manipulate people into thinking that their mobile network and support is of top notch and a step above the rest. This is most certainly not the case.

What an absolute disappointment. I have to now wait almost 90 days before I can get my number away from this horrible company and go back to MTN or Vodacom where things tend to just work as they should.

Do not waste your time and effort moving from your current service provider to Melon Mobile.