Very poor customer service. Sent wrong part, so I ...

Very poor customer service. Sent wrong part, so I ordered a replacement on a separate order and requested a return. They initially wanted me to pay for return shipping, even though they had sent the wrong part. After a few emails, they agreed to pay for return shipping for the incorrect part and issue a refund. However, once I sent the part back, I received an email saying that they were sending me a replacement. (Even though they promised a refund) Order 159563436 and 159371774 for reference.