Amrita Singh's mother Rukhsana Sultan tried very hard to influence B.R.Chopra to sign Amrita Singh for the film. Chopra was on the look out for a fresh face and had already told Zeenat Aman she did not suit the role. Finally Chopra discovered Salma Agha and signed her. This angered Sulatana to no end. This is when Salma Agha started getting harassing and threatening letters and phone calls. The letters warned Salma to return to London or face dire consequences. Salma decided to ignore the warnings and remained in India. The letters were finally traced back to Amrita Singh. But by then she had already signed Betaab and no charges were filed.