CryptoQR on the play store. You can link muun, wallet of satoshi or blue wallet. Have not tried others.

You can put fuel in at almost any fuel station that has the scan to pay feature.

You can buy clothes at Mr Price.

A lot of other stores as well.

Ask for "Scan to pay" specifically. Don't even mention lightning or bitcoin, most tellers would not know what you are talking about.

The company that takes your sats is called cryptoconvert.co.za