You'll need to provide a bit more context and information than that if you want assistance from the Community Forum.
What exactly do you mean by "credit of start a plan"?
I presume by "credit" you mean a monthly membership plan?
What happens when you try to buy one here?
Any error messages?
When were you last able to successfully buy a membership plan?
Is your payment card still valid, isn't frozen via your online banking, and there are sufficient funds in the account if it's a debit card?
If you need to contact 48 support about this then see the links in my signature below.
