HELP! CAL rejected but already got a LOI

[sinaballerina]

I recieved my Letter of Introduction(at my CIC account) at 12.01.2015.
Before that my IEC Application(on my kompass account) was approved and I got the CAL.
On 30th March 2015 my Application on the kompass account got rejected without any reason.
Am I still allowed to got to Canada and work with my LOI of 12.01.2015?

Please help me!