Costco Promotion 250186 not working

Ported over 2 lines from ATT at the end of March at a Costco Kiosk. Qualified for 2 promotions. 240150-Costco gift card and 250186-Prepaid VISA card. Kiosk employee had me try and submit on promotions.t-mobile/com that afternoon but neither promotion would work. Ported numbers not available in the dropdown. I waited 3 days, tried again, no luck. I've been in contact many times with customer service over the last 1.5mo. They were able to submit an application on my behalf for 240150-Costco gift card but claim the 250186-Prepaid VISA card promotion is too new and are unable to submit for me. My ported numbers are still not available on the promotion website dropdown.

Given that customer service is unhelpful I'm not sure what I'm supposed to do at this point.