Missing Rebate??

I purchased the Clearblue Easy Fertility Monitor and 30 test sticks from Costco in February when there was promotion for spending over a certain amount on Clearblue products and getting a $40 Costco card after mail-in rebate. I mailed in the required paperwork back in the beginning of March and still have not received the $40 Costco card. I contacted Costco directly and they informed me that the rebate was through Clearblue and not Costco so I must contact you to find out the status of my rebate. Can you please tell me when I can expect to receive that??