I would start with ICASA as they are the formal regulator for telecommunications. You can consider opening a file at your local consumer protection office as a start. Also you can register a complaint with icasa that is if icasa recognise them. If not then find out if there are a legal provider as this will open a new can of worms.
You can then inform them through the use of a lawyer that you are now taking formal legal action. Your lawyer will know what you can and cannot do so first take some time to talk to him get yourself informed.
Also find out from your lawyer if you can hold the business owner responsible and find out if you can send him a summons. In most cases you can and talking from experience they hate it if someone shows up handing them a summons. Especially if he/she has employees in place to prevent such steps...
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