text message notifications of low minutes from T-Mobile

Hi Everyone,

I am currently in a dispute with T-Mobile, and they are pretty much accusing me of lying about a service I had been received for the first year and a half of my time with them. I had been receiving text messages from T-Mobile when my minutes were low and a single text message when I first went over. T-Mobile is insisting they do not do this. The messages stopped when I upgraded my plan. A customer service rep I have been dealing with is insisting that I must have signed up for a third-party service. I never signed up for said service -- the messages just arrived.

Has anyone else ever received such notifications?

Best,
Judy