Vodacom Incompetence

First indecent was when I traveled to Zambia a few months ago. I activated international roaming, Vodacom confirmed everything was active before I left, and I very clearly stated to the agent that I needed this to work and they assured me that it would. Big surprise, when I got there, it didn't work. Contacting Vodacom from a prepaid number that side cost me allot of money to no avail, I was a week without my phone in Zambia. Last week I traveled to Mozambique, yet again I contacted Vodacom to activate roaming and they assured me that it was active, yet again upon arrival it didn't work. Now I'm beyond frustrated. Yet again I had to purchase a prepaid sim with airtime to contact Vodacom, spoke to a gentlemen named Abraham at 10am on Friday 22/01 and explained to him, and he promised me he would phone me back on the Moz number provided, obviously he didn't. How difficult is it to activate roaming on an account and to ensure and test that it is actually working?? And to just phone a person back! I'm really struggling with the incompetence here, and it's costing me money and business.