Given yesterday's technical meltdown and massive packs of sellers calling about defects it's not a surprise.
Try calling back when it's not so busy like early in the morning or late at night.
Depending on what you are calling about you may be offered the "call back" option, use it!

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.