Transfer of sponsorship

Good day everyone. I hope someone help me with this.

I left my company over 6months already. I didn't finished my contract and they terminated me. They let me go though, and told me to find a new sponsor. Now that i found new sponsor, they are not releasing me. How can i deal about this. So many times i contacted them, and even went to the office, but no admin staff is there to take my inquiries. How do u deal with this? My iqama expired 3months ago already