I can't give you the date. An EE ROM would solve the problem, but not that one. That is about 3, maybe 4 SW updates old. It would take hours afterwards updating it.
Your problem is not with the phone. Your problem is not with your SIM. Your problem is not with Nokia. Your problem is that Clove have sold you a device telling you it is 4G, and it isn't.
From my perspective you have two options;
1. Go back to Clove and complain that they have mis sold you a device (which I told you to do months ago).
2. Wait for the update.