I have a bill pay account with vodafone for personal phone use.
I also have a pre pay sim card installed in an alarm system at home, I top this up every so often to keep it going. I had the app downloaded and was able to check balance an top up through this. For some reason the app crashed and I got kicked out and asked to log in again... only issue is I cannot recall the password! Its very difficult to reset as texting the sim card a link is no use as it is in my alarm, and if I try to reset using my email address it automatically thinks I'm trying to reset my bill pay personal phone account.