Your post is unclear. What exactly did you buy on Friday? Credit? Membership? An add-on?
What does your online account say about your membership status, expiry date and calls/texts/data/credit balances?
https://48months.ie/dashboard
What does your account history say about recent purchases?
https://48months.ie/orders/history
If you have a current membership then any chance you breached the fair usage limits and got barred for the remainder of the membership month?
http://www.48months.ie/boiler-plate/terms#18
Remember that if you have a current membership with time left to run then buying a new membership will not supersede it and prematurely terminate it. The current membership must run its course. Check in case you bought a membership which has now "stacked/queued" up to kick in when your current membership expires.
If you have used up your calls/texts/data allowances on your current membership then you may need to buy an add-on to tide you over until the membership expires:
http://www.48months.ie/deal
If you are still having problems then maybe log a support query to get 48 to help?
http://help.48months.ie/requests/new
Hope this helps.
