VPN over LTE not working!!!

I have been connecting to our company VPN for many months now over Telkom LTE. All of a sudden I cannot connect anymore. When I put in my Cell C sim, I can connect. This is a Telkom problem and it needs to be fixed fast or I'll cancel my contract due to non-service delivery. I am paying alot of money and suppose to be able to work remotely - so this is no small issue.