Telkom Uncapped LTE erratic connection

For the past couple of weeks I've been having major connectivity issues with my uncapped LTE. Every 10 minutes or so the connection will drop for 30 seconds to several minutes. I've spoken to several call centre agents who all give me the same steps to follow. I've tried restarting the router. I've done a factory reset. I've changed the profile, I've changed the antenna from external to internal,. I've changed the band and selected the network manually. Nothing helps and they refuse to send a technician or investigate an issue at the tower. After going through the motions I get a "It's congestion on the tower" response...which is nonsense because in between disconnects, my speeds are anywhere between 20 - 40Mbps. Congestion would slow it down but not give random disconnects....

Bitterly disappointed at the lack of assistance.