3 month intro deal

I bought my SIM via Amazon for £2:50 on January 27th .
The deal was first 3 months at 1/2 price i.e. £2:50 p/m .
March 4th Lebara took £5 out of my account.
I cannot find out what is happening

APJones65 I'd suggest getting in contact with customer support for help with this one. They will be able to take a look and see whats happening with your discount.