If they don't improve, they deserve to give each of their money spinal.
Fortunately, many drop shipping suppliers now give you a shipping number; so you can constantly check where the situation of your product is. https://Maps.Google.mv/url?sa=t&url=https%3A%2F%2Fbrandafy.com%2Fblog%2Fbigcommerce-vs-shopify%2F%3Futm_source%3Drss%26utm_medium%3Drss%26utm_campaign%3Dbigcommerce-vs-shopify