You should use good quality ka Shampoo and conditioner. Your hair is falling because you are not taking proper care of it.. Once you do hair rebonding you have be very careful about your hair. you do get straight and soft hair but they become little sensitive so using best products for your hair is worth it.
You should buy L'oreal of Schwarskopff products. the ones which are either for chemically treated hair or for dry and damaged hair.