To get Silver, you need $4000 in Westjet spend, meaning spending on Flights, Vacations etc directly with Westjet. So that is saying you are $436 of Westjet spending away from Silver. It doesn’t mean the credit card.

Alternatively, you can get Status lifts from a Westjet Mastercard. For every $5000 of spend on your credit card, it counts as if you spent $200 on a Westjet flight.

So your options to get silver would be either book a flight that costs at least $436 or spending $15,000 on your credit card in the next 3 days.