Judges range in how they feel about these complaints, generally you won't be able to claim just for the time they've wasted, you'll have to justify why you have suffered damages. Extreme cases are different, if they're truly wasting huge amounts of your time, but the occasional email is unlikely to be enough for wasted time.
Alternatively, you can get the ICO to tell them off even if you haven't suffered any damages, but that's not always easy…
http://www.legislation.gov.uk/uksi/2003/2426/regulation/22/m...
http://www.legislation.gov.uk/uksi/2003/2426/regulation/30/m...
Judges range in how they feel about these complaints, generally you won't be able to claim just for the time they've wasted, you'll have to justify why you have suffered damages. Extreme cases are different, if they're truly wasting huge amounts of your time, but the occasional email is unlikely to be enough for wasted time.
Alternatively, you can get the ICO to tell them off even if you haven't suffered any damages, but that's not always easy…