Telkom LTE not allowing VPN access

I have been accessing my files at work from home for ages using my Telkom LTE without a problem, suddenly I no longer can through Telkom, but I still can using my MTN sim. After a 43 minute phone call and an "online chat" with a Telkom Agent I am now told that because my sim is not registered as a business account I can not access VPN. Nobody is interested in the fact that I could always before, why suddenly not now. The IT people at work said I had to ask Telkom to unblock some protocols which the agent said they cannot do. The sim in question ********** 618