Well first off, was the deal ever on? We only ever had his agents words on that this was all signed sealed and delivered. Forest didn't ever say anything of the sort.
Siphiwe Tshabalala's agent Jazzman Mahlakgane has said the deal is on ice and that they are in talks with other clubs, one in England and one in Belgium.
Therefore, the critique that Forest had never said anything and that the agent was just currying interest for an alternative deal. Additionally, He is wanting to stay in South Africa for his Chippy business empire interests.
finally it appears Forests failure to get promoted may be why the agent has made this move. It seems they wanted a high profile move, which they no longer see Forest as.
Your loss Tshaba.