@ohgodwhatcanido
I think this rule of having to ring in yourself is a load of wanky fucking shite, and it does my head in.
As for '3 days in 4 months is 3 absences and would require an interview.....' I know it does in some places. My husband's old workplace said if you have more than 3 in 6 months they will interview you to find out 'what is going on.' 
The HILARIOUS thing is, that the 'rule' applies if it's '3 separate days' off sick, or 'one week off, a three day stint off, and a fortnight off.' Dumb as fuck.
I reckon they want the sick person to ring in so they can try and bully them into coming in. 'But we haven't GOT anyone to cover you.. at least TRY and come in.....' 
Unfortunately, lots of employers are like this now, as all they care about is productivity and profits, and most of them give zero fucks about the welfare of their employees. Don't say it's not true coz it is.
OP, I hope your DH will be OK, but his boss DOES sound arsey and fed up. If I were your DH I would ring in and ask what the problem was and why he was shirty with you.
Take no notice of the people saying he will be sacked for having 3 separate days off in 3 months. That is a load of shit. And as for the posters saying '3 days in 3-4 months is a HUGE amount of time off!' Course is isn't! And if people ARE having SOOOO much time off, it's no wonder if they are working somewhere that treats you like a piece of shit.
Saying the employer 'wants the opportunity to help the employees' is a load of bollocks; they just wants them to get the fuck back to work It's laughable to suggest that the employer needs to speak to the employee because they CARE about them.
OP if I were your DH I would be looking for another job.