Experience letter

Hello everyone, I worked 10 months in Recruitment firm. Due to covid 19 firm got shut down, I asked employer about my financial condition and resigned from firm because of firm is shut down, they said ok.. Before that, in April month ma'am msged me and "*I forgot to reply that msg"* it was only for 1st time ** After that i I join 1 organization, and they were askig for experience letter so i inform to my ex employer, she yold we'll give you experience letter as you submits company's phone. So i called them, to submit company's phone which was with me.. i submitted that phone with employer's coordination till that time ma'am was talking with me nicely. Before that i join one organization and they are asking me for my experience letter. I asked my ex employer to provide me my experience letter then she told me, Priya, Do you remember i msged you but you didn't saw that msg and didn't reply on that. Why? You don't know you'll get experience letter from me only.. I replied politely ma'am , i might be forgotten about that.. So she said you did it knowingly , she was too rude on that time, she told me if you are not replying me it means you are absolutely abscond..then why i should provide you experience letter... i told her ma'am, i was in touch with you .. i asked you and you only told me that i should go for other job because Company is shut down. I told her about my work with her organisation. and you can check my record with Sir also, you can check my performance. So she told I'll provide you experience letter in this 2,3 days.. Till that day .. i am continously calling her but she is not accepting my call, she declined my call. Then i called Sir, ( Her Husband) told him about this.. he told we' ll provide you.. But i am not getting surety from them.. because it's almost 2 months over, I am asking for experience letter. What should I do if they don't provide me experience letter.??