Or "experiencing a higher number of calls" or whatever chirpy message they play on repeat. I actually cannot remember the last time I had to ring any customer helpline for any business or govt department and didn't get told some version of the above!
If you're always that busy then no you're not busier than fucking normal, this IS YOUR NORMAL and you might as well just stop trying to gaslight your customers into thinking otherwise.
And breeeeeeaaathe. May as well settle in for some yoga with Adrienne while I wait for Royal Mail to answer 