Invalid Reciept number

The company which has filed H1b for me said that my case has been picked in the lottery got my reciept no 2 months back 2015 May (EACXXXXXXXXXX) no spaces. i am trying to check my visa status in site its giveing below error any one plz educate me on this.

Validation Error(s)You must correct the following error(s) before proceeding:

My Case Status does not recognize the receipt number entered. Please check your receipt number and try again. If you need further assistance, please call the National Customer Service Center at 1-800-375-5283.

I dont think they gave the right number, ask them to check once or else ask them to share I-797C the acknowledgement notice.