Vodacom Service? Dismal!

I have been having a problem with my contract, and everytime I ask Vodacom to assist with it, I get treated like an idiot, and eventully, shrugged off without my problem being resolved.

The problem has been ongoing now for nearly 2 years. All was fine while I was on prepaid, and also, there is no issue when I use other SIM cards in my device (So NOT the device, or the user, like I keep getting told). On my contract, whenever I make or receive a call, my mobile switches to 3G from 4G. When the call is done, it switches back to 4G. This happens regardless of signal strength, or setting on my phone.

I have raised this many time, but still, no resolution. This last incident raised, has been closed, with no contact, or to see how happy the client is with the fix. If this is the level of service I can expect from Vodacom, I'm taking my business elsewhere when my contracts expire. There are other SPs out there that are more willing to get my business.