so guys first of all tell u that ur mobile should be rooted by that u can change ur imei of mobile
or use bluestack rooted with xposed module and imei changer .google it u will find trick to use bluestack and how to change imei or use new mobile on which redbus is not used
first signup redbus using ur refrral of old account
u will get 100 on signup
after that use NEW150 promo code at last
note:- all details are new like ur email id and phone no to apply this promo of 150.if u use ur old redbus details then they will detect u.if 150 promo not work then use 100 off code enjoy.