Cannot sort out roaming in 3 weeks - bad service

The roaming problem was reported on 17Jun (#***4). I also visited MTN stores twice to report the problem (REQ:*** and REQ:***), send an SMS to 44303 and visited an MTN outlet twice to escalate the problem (REQ:***). Only after a week was MTN able to provide an SMS roaming service, but local calls to the number are simply cut off without even diverting to the voicemail that was set up before departure. After escalating the problem, MTN succeeded in only allowing the user to make calls 4Jul. Calls to the number is still cut off without even diverting to the voice mail service. The constant response on repeated emails and escalations from MTN is 'that everything is loaded'. This however does not resolve the roaming problem and it appears as if MTN is incapable to locate the problem. Even the High Value & VIP Call Centre could not resolve the problem. The user, a Professor and head of a Law department at a local University, will be abroad until 20 June. The user already missed an urgent call by the Executive Dean regarding an extremely urgent faculty matter and another by an advocate who required a legal opinion. The user also missed numerous birthday calls!