Did not Cancel Employment Pass from old employer.

Hi Guys,

I am from New Delhi, India working in Kuala Lumpur, Malaysia. I started working in Kuala Lumpur in last year  August (2015). During my next 3 months, I was badly mistreated, my salary was always late (sometimes 1.5 months delay or in instalments) and I could not continue my work in the company so I decided to leave the company in the end of October, 2015. I immediately got a new job but my old employer refused to give me my release letter or tax receipt in order to proceed for stage 1 visa from my new employer. I chased them for next 7 months, finally after calling 10 times a week for 7 months they decided to pay my taxes and give me release letter in the middle of may, 2016. As I could not take any other job during this time, I decided to freelance for my new employer. I was not informed that i had to cancel the EP from first employer when i got my release letter. So after getting the letter My new employer started process for new EP but unfortunately it took another 2 months to settle everything. My Visa expiry date was 1st August 2016. So my new employer got me a special pass for a month. Now My old company refused to give me a new release letter which my new company requires (which should be dated 1st August 2016). My worry is, I did not cancel the EP after getting the release letter which I have been told, might give me trouble when I come back to Malaysia for a fresh new EP process. (if I go back to India before my special pass expires) I need to know what could I do to fix this situation ?