Hi
I am in Human resources, so can give you some pointers on the matter.
Firstly there are two seperate processes that an employer needs to follow, depending on the situation .
the first process is for misconduct. this is when a rule is broken and relates to conduct in the work place, the employer would issue a verbal, then written and then final written warning for misconduct, the aim is to get the employee to rectify said behaviour. You dont always have to follow the route of VW then WW and then FWW, it depends on the severity of misconduct, ie theft could result in immediate dismissal for a first offence.
the second process relates to performance,
the process for performance management does not involve issuing warnings, the employer needs to sit with you and hold an initial counselling session, during which he advises you of the required level of performance and where you are not meeting standards, he would need to discuss a plan with you for improving performance, ie what can you do to improve sales and how can the company can assist you ( ie training , etc) there would also be specific review periods discussed and time frames by when you would need to improve your sales (there would be specific dates and targets disussed)
This initiall counselling session needs to be documented and signed by both parties.
Your employer would then meet with you on a regular basis (ie every second week or every month ) to discuss if your performance has improved, where ou ahve met target and where performance can still be improved.
During this performance management process you would not be issued with warnings, but rather all discussions documented, if at the end of say 2 - 3 months performance did not improve then they would hold a disciplinary hearing for poor performance and you may be dismissed.
The company needs to prove they made you aware of the standards they required and tried to assist you in rectifying your performance and that they then gave you a reasonalbe amount of time to rectify behaviour.
From what you have sad, it sounds like you didnt break any rules, but rather just didnt meet your sales target and that they should have followed a performance management process.
If they do dismiss you, your employer would need to prove two things to the CCMA
1. Procedural fairness - did they follow the correct procedure
2 Substantive fairness- did the punishement fit the offence ( in other words did your behaviour warrent dismissal)
The CCMA will often side with the employee based on procedural fairness.
You can win up to one years salary from your employer or reinstatement. the CCMA would ask you what you want when you fill in the forms to raise a dispute ( they often order the eployer to pay out a settlement if the relationship has become intolerable)
most cases I have handled the CMMA awards around 3 months salary as settlement to employees.
Hope this helps
Good luck