Whats a reasonable amount time for a refund?

[cwylie]

Ordered an A/C compressor and mount and the incorrect one was shipped for what I needed but I ended up changing the entire setup anyways. Shipped the mount and compressor back to the company in the same box it was shipped to me and they received it on 1/29. I have called a few times and been told its pending but they are very backed up. I got a call from them last week telling me it was being processed but it never hit my card. I called today to check on the status and I was told again it was pending and they hoped they would be able to have it processed next week.

They were always busy when I called to try to get info but helpful and told me they would not charge me a restocking fee if it didnt work out so I am trying to be patient but we are working on almost 4 weeks from when they received it back.

Keep my calm or try to push the issue a little harder? I dont want to get slapped with a 25% restocking fee just because they think I am a pain in the rear.