It seems Teespring has their wires crossed (Patreon)

..and even though our rep told us one thing, we are getting different feedback from you all and Teespring’s social media. We are genuinely disappointed in how this is being handled and we completely understand if this experience results in less people buying merch. 

We are still waiting to hear back from the original rep who told us to have everyone reach out for partial refunds. In the meantime, the discount “Sakuraipls” can be used an unlimited amount of times. So to cheat the system, you can separate different “listings” into different orders (order one listing, use code, check out, then start a new order) and use the code on each order.   

We get that might be annoying and take more time so we understand if people do not want to do that. At this point, we are unsure of what to do until our Teespring rep responds to us.Returns and Cancellations – Spring answers (teespring.com)