First of all Chamisa is not in charge of mobile networks, Goche is. Chamisa has no ay whatsoever.
Secondly, it is foolish, is anything, unrealistic, for him to suggest lowering the price of calls in Zimbabwe. The government would be cutting its legs off.
Econet is the biggest taxpayer in Zimbabwe, and if Chamisa & Co reduce the price of calls, the government will lose a lot of revenue, which would have to be made up elsewhere...like increasing your personal income tax, or other taxes, for example.
In the end you will be worse off. Better to have higher call charges than higher taxes. At least you have the option to call or not.
Call prices will not be reduced any time soon. What the minister can only suggest is boosting the market share or business of cheaper VOIP options.