Contact 48 support:
http://www.48months.ie/help#ask-a-48-agent
If the new membership has started already then I don't think that they can/will do anything and you will just have to see out the membership month with the "wrong" membership.
If the new membership has not yet started and is still stacked then you can contact them and they may be able to issue a refund or switch.
I didn't know that Standard got listed at all anymore.
As you probably know it never really makes sense to buy Standard when Guido offers more for the same price.
One way to avoid this problem is to enable auto membership renewal:
Automatic membership renewal
Hope this helps.
