International Calls Complete Mess!!!! Disgusted at the service

I have recently started dealing with the UK for work and business opportunities. And kept on getting replies from prospective partners in the UK that when dialling my number they could not get through... I listed my number as +27722****** but every single person cannot get through to me. Eventually I phoned into vodacom and found out I need to activate my international calling, which they claim was activated but still numerous people from the UK could not get hold of me. I have been a loyal client spending big money every month for 20+ years and this is the service I get.... There is no person during this time that can afford to lose business opportunities because of *********** procedures or staff that are not sure what to do. I first get an sms to say my int calls have been activated, 2nd sms my roaming has been deactivated, then 3rd sms my roaming has been activated after numerous calls and no help. So now I'm just praying that this big opportunity call that is scheduled in an hour manages to dial and get through to me. Vodacom this is ridiculous that incoming international calls are blocked.