Demand notice u/s 143(1A)

dear colleagues
good evening,

mere ek Clinet ka demand notice Ay 15-16 ka aaya hua hai??
actually Ay 15-16 ka ITR other CA ne file Kiya tha na, or ab clinet ke pass naa toh uske contact num. hai na hi name pata hai
ab hume iss demand ka reply krne k lie ay 15-16 ka intimation download krna hai because vo portal se download nhi ho paa rha hai
koi solution ho toh batae

regards,