Unless there actually was a recent major event like a power-outage or security-breach, DON'T BELIEVE IT if a company's caller-greeting recording says that, "We are currently experiencing higher-than-normal call-volumes; you may stay
on the line and wait for the next
representative, or you can leave a call-back number for one of our reps to return your call during this same business day, or you might want to try your call again later"... again, DON'T BELIEVE IT --- in all likelihood, this is merely what they ALWAYS tell ALL of their customers who call, no matter what time-period it is ! And whatever you do, DON'T THINK THAT "LEAVING YOUR NUMBER" WILL CAUSE THE COMPANY TO CALL YOU BACK... I have waited ALL THE REST OF THE DAY for a call-back, and the company **never** got back to me!
The best thing to do, therefore, is to simply "stay on the line" to "keep your slot in the cue", even if it means a long wait... better to eventually get through than never reach a live person at all.