Impossible to connect to VPN

Hi, we bought a 100 GB pre-loaded data sim from Cell C and requested in the Cell C shop that we wanted access to our company's VPN. They gave us a form to fill out in order to request \unrestricted APN""; but since then it is impossible to connect - not only to the VPN; but also to the internet in general. The latter is possible on and off;but only when the APN on the router is set back to \""internet\"" instead of \""unrestricted\"". Connection to the VPN is totally impossible.<br> <br> I have phoned technical support and they say that since I use a TP-Link router and TP-link 3g ****le"