I phoned them again today and they told me my card is logged to be printed today and then posted out. The lady told me it could be up to 10 days before I receive the card. 
How does it take 10 days to post a card?! So frustrating.
I’ve been offered an interview and assessment but it’s their company policy that the driver has to have all 3 cards (licence, tacho and Driver CPC) with them when they attend. So here’s hoping the card arrives well before the 10 days.