There are definately more qualified people out there to answer in detail and would probably also need more information as this is very limited.

Some of the limited knowledge I can provide is as follows:
1. Read the full contents of the Labour Acts - They are available online at www.acts.co.za
2. Constructive Dismissal requires you to "prove" that that the company or manager/boss made working conditions impossible, and usually with the "intent" to force you to resign. Burden of proof here is all on you.
3. CCMA doesn't cost money to query and they can give the first line of information, without legal fees/costs - see what the feedback is from them.