Unable to activate my INT roaming

I am currently writing this from Namibia. I work here and have done for many years. Roaming is a necessity for me in order to do banking, etc. With my previous contract my roaming worked fine but since my upgrade it does not work at all. I have been in to 3 different MTN support stores and have called the tech support line many times. No one can help!! Store says that they should be able to, but can't change my roaming status on their system. Tech support says it is active on their side but it isn't!!! I have exhausted all options. All that Tech keeps saying is that they have refreshed my SIM settings and then tell me to switch my cell off and on. It DOES NOT WORK there is an issue with my profile on the system for some reason but no one seems to want to go a step further and inquire at a higher level. This seems to be above the basic tech support's level of skill/knowledge but they still do not see to it that a more skilled person contacts me. I have heard the phrase \ it has been escalated"dozens of times but have yet to see a result or receive a call or mail. I am now stranded in Namibia without roaming. Starting to doubt my porting to MTN. """