In your shoes, I would check and compare the brokerage fees for the banks available to you in Mauritius. Compare the annual cost of the brokerage accounts and the cost per trade (depending on which stock exchange you want to trade). Usually direct (online) banks are the cheapest.
If you have a brokerage account, you should be able to buy almost any ETF (exchange traded fund) that is available in your country via the stock exchange. Look for ETFs that are mirroring broad market indices (e.g. MSCI World for worldwide coverage, S&P 500 for US, Stoxx Europe 600 or MSCI Europe for Europe, MSCI Emerging Markets and similar indices) and have a low expense ratio.
Regarding your brokerage account: If I look at these statistics, there seems to be not that much ETF trading activity at the Mauritius stock exchange - that kind of illiquidity could lead to irregular ticker price movement (
http://www.stockexchangeofmauritius.com/etfs/). Maybe it is better if you look for a brokerage account that also offers you access to international stock exchanges at a reasonable price. I guess the South African stock exchange would be the largest exchange close to you, safe bets are also other large international stock exchanges as e.g. New York stock exchange, London stock exchange, Amsterdam Euronext and so on.