Relieving and experience letter in case of resigning without notice

I had been working as an assistant manager with a private Bank for last 4.5 years but now I left the Bank without serving mandatory notice period of 90 days due to my father's medical exigencies and I shifted in Bihar my home town and here I got a job in PSU , joined it.but my present organization has called up my previous bank's HR for my verification. Now my previous HR (Bank's HR) is very furious after hearing this on me and telling me that he will issue me a voluntary abandonment of service (VAS) certificate instead of providing me my relieving letter.only experience certificate will be given to me because they have initiated VAS process again me. I have made payment of 90 days salary amount for non serving of notice period.kindly guide me what shall I do so that my experience and relieving both can be issued?