What expiry date is displayed on your online account? Perhaps you bought a membership which has stacked because your current one has not yet run its course? In that case when your current membership has run its course the stacked one will kick in. In the meantime if you have used up some of the services on the current membership then you may need to purchase one or more add-ons to tide you over.
Your credit balance being €0 is not surprising. When you pay for membership the money paid goes on that immediately. It does not appear as a credit balance on your account. It is used to purchase the services bundled with the membership.
http://community.48months.ie/t5/Most-Popular-Questions/What-is-the-difference-between-membership-and...
Hope this helps.
