Apologies for nit-picking at punctuation, but occasionally it matters :-)
"Twilio is over-billing ..." = Twilio is charging more than they should.
"Twillio is over billing ..." = Twilio has given up on billing. It's so over.
Just my personal bugbear - but sometimes it's worth getting this sort of thing correct. Apologies if this is just a US/UK difference, also (I'm in the UK).