Iqama will expire on april 2020

I have been here in saudi arabia since 2016 and its almost 4 years i got terminated since oct 2019 and its been 3 months i dont have a job on oct 2019 i files a case in MOL because my sponsor not giving me my benefits and overtime pay since then i didnt get amy job now i have an offer from a new company and i asked my old company  for a transfer and give me my release paper and they refuse because they are saying i filed a complain in MOL and asking me to write a letter or a clarification letter that i got all my dues and i dont need anything from them to br able to give my realease paper and for them to approve my transfer but i didnt get any end of service and overtime pay i only got the unpaid leave and couple of days salary.

Now i want to ask if i can transfer to the new company without there approval my iqama is going to expire on april and its only 3 months before my iqama expire can i transfer??

Kindly please answer my question very urgent please reply