Who called from 2018913302

I keep getting calls from this number. They don't leave a message.

Was an automated call from MedCo, advising me that they received an Rx from my doctor and I should get it in about 9 days.  My first time using them, so I didn't recognize the number...

Legitimate call from Express Scripts to let me know that my prescription order was being processed.

Left a blank voicemail.  I called the number back and it was Express Scripts.

The only content in this message was "goodbye". The "interactive" calling from a computer does not work. They have called in inconvenient times and then asked me to hold. WHAT? I hung up. Now I don't answer.