Can you double dip on Miles Boosters?

Hi guys,
I purchased a Miles Booster last week for reward flights, with the bonus at the moment, I am taking away a lovely 18000 miles!
I did it through the call centre, but the website is still letting me buy one, can you do two? As in one online and one over the phone?
Regards
Col
I purchased a Miles Booster last week for reward flights, with the bonus at the moment, I am taking away a lovely 18000 miles!
I did it through the call centre, but the website is still letting me buy one, can you do two? As in one online and one over the phone?
Regards
Col