See I quote Surbhi: "Mera visa jo extend hone wala tha inki employment letter ke waje se, ab woh kuch nahi ho raha, toh i'm going back to New York."
Which means that Zoya is yelling at Asad because his employment letter was SUPPOSED to help extend her visa, but she believes it's not happening anymore, so she thinks she has to go back to NY.
In the meantime, Karan said: "Arre nahi, main nahi chahta hoon, aur woh jayegi bhi nahi. Woh actually kya hai na, itna gussa ho jati hai, toh jab tak koi insaan unko explain karke bataye, tab tak woh aise bomb phorke aise bhaag jaate hai."
Which means Zoya is definitely not going to leave, but there is some mishap that happens with regards to trying to get her visa extended, and Zoya blames Asad for it without listening to his explanation.
As for my own two cents, maybe Asad's attempt to get a work permit for Zoya fails, and then he tries something else and that works instead. I don't know... just saying haha.