What's the point of using a referral code instead of you lowering the price?
About the situation, it's either they didn't find the time to answer you yet, or they are uncertain that there card is going to be fully working.
Anyway, Wagecan issuer is Visa, and I am pretty sure that if they were able to get all the documents to get approved( so they can make credit cards behalf visa), then there will be no problem.
Just keep in your mind that after you reach the limit of 2000$ you are no longer able to use the card anymore, so if you gave it to company as a recycling payment, then you will spend some time to change it.
2000$ lifetime limit? Seems that they do not forward the clients documents for verification to their card provider. Look here per sample:
https://help.wirexapp.com/hc/en-us/articles/115001824585-Wirex-unverified-account-limits Maximum lifetime transactions value: 2000$