My guess is that you have used up your current membership allowances but the membership has not yet expired.
In that case you need to buy add-ons to make further calls or send texts.
http://www.48months.ie/membership-plans/add-ons
Buying a new membership does not help as it will simply stack to kick in when the current membership has run its full monthly course and expires.
See these key posts:
Bought membership - can't call/text
I bought my membership - why can't I call or text?
If that's not the issue then post back with more info if possible.
Hope this helps.
