Esic challan number

I tried making esic payment online but due to a technical problem I couldn't complete my payment. Also I didn't note the challan no. 

Now when I go to "Generate Online Challan", it says that the challan is already generated and to check in "Modify Challan" or "Online Double Challan Verification". I checked in "Modify Challan" but it says "No Challan Generated for the period". 

How do I get the Challan Number and make payment ?

Thanks in advance.