what does a suspension look like?

I had a weird incident today, went to WM to load it, type my phone #, confirmed the $800 load, but then cashier suddenly says it can't be completed. I did light MS on this from the start, and haven't done any loads in 2 months, only did some light spending on it. I didn't get any messages from them, and was able to use at checkout later in WM.

I wonder if my phone # is banned by WM, since it does block MO purchases. Maybe they ban numbers after a certain amount of MS activity per month.