i kept all my LC coins in my bank whenever i got them and one day i logged into to -40 LC coins was not happy to see that but thankfully they where doing the give away so i managed to get my LC back from the negative.
It should be noted that the 150 point redeem is only if you have a negative balance. official instructions are vague, but i think you might need to open a support ticket. even if you are under 150 LC as your original LC count was under 150 LC prior to the fuck up and they are tracking these numbers.