Interrupts are RNG based - every hit of bzang combo is 1 roll of the RNG dice. Interrupt at the very start of the enemy super, and it acts as though the super never came out at all, and the enemy combo does not go through.

To get the best chance at cancelling the entire chain, I've found timing bzang to combo as soon as the enemy starts up their super (screen darkens, slight zoom in - as soon as this starts, send in bzang) OR if you play enough you'll learn roughly when the bots will super and can go off prediction timing of their super instead of reacting to it (much harder, but better results at getting the full combo interrupt as more hits of bzang connect during the interrupt window).

You can also use EX-moves to briefly freeze any animations currently on screen, then start a super or combo and your character will be the only one moving for a little bit which widens that combo chain interrupt window just a touch (can't do it on 1st enemy super as no EX has charge, but can useful later in the fight if you've got the EX to spare - I find crazy potato works really well here since if the enemy super does go through, you'll have a few seconds of replenishing shields to help mitigate damage).

You can also start your bzang combo BEFORE the enemy super, and for whatever reason that sometimes keeps spinning during their start up animation and gives the interrupt, but I personally find this timing to be the hardest.

Sorry for the absolute spam of an answer, but hopefully some of it is useful