Roaming cost nightmare

Was on holiday in US, and activated TravelSaver via vodacom app. The first time did not stick, so it was deactivated and reactivated on the same day to ensure a fixed roaming cost. According to Vodacom, an sms was sent on the 17th of May, but an sms was only received on 19 May. IN addition, we were still en-route on the 17th to Frankfurt. Since the first sms indicating a high roaming cost, I have phoned and reported the matter for investigation numerous times. During this time Vodacom have shifted the call to many different departments, and the final report was received which indicated descrepancies on the activation of Travelstart. I clearly informed them of the issues with the dates, but they chose to close out the call without even informing me. From my view travelsaver was activated during the time, and I received no indication of anything different. I find it completely unacceptable that Vodacom firstly just close out a call without even looking at the descrepancies, or show that there might be an issue with activating travelsaver via their app.