KVR - Change of Employer - How does it usually end ?

Hey,

did anybody go/is going through the process of changing their employer upon getting terminated from previous employer and then finding a new job ?

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I've recently been terminated on 28th Jan, notified them about it, they said I need to attend KVR by latest 15th of May and prove new employment, 6th of March I applied for a change of employer, my join date is 1st of April, emergency appointments are of no help, blue card emergency appointments are not available at all. i don't know what to do at this point? already contacted them by their contact form, some email that was written on the paper that was handed out to me when I applied for blue card. is there anything else i can do at this point ?