Why I don’t see my VEGA contacts in VEGA?
Vega is an international messaging app, which means it relies on international phone number format ( +[country code][operator prefix][phone number] ). So your contacts should be in this international format. In example UAE number in international format should look like: +971 052 123 4567
Go to your Vega contacts in contacts app, and make sure they are in international format. Relaunch (kill and start again) the app, and after a moment your contacts should be updated.
Note: There is no difference for your GSM operator what format you use: local or international, so all the local calls and SMS will continue work.