It looks like you're selling. You had 2 sales today alone and have 3000 plus listings. I also notice you have free returns. I've read where others are having the MBG added to their listings even though they state they won't accept returns.
Ebay has a money back guarantee. No returns does not mean not refunds. You have to accept returns.
Here's some info on the MBG:
https://pages.ebay.com/ebay-money-back-guarantee/
You may have exceeded the monetary limit or listing limit that you are able to list with your other issue. You can ask Ebay to increase your listings. You may want to try that option. Also, don't bother with Ebay CS. Waste of time. Go here and get the correct answers and results:
https://www.facebook.com/eBayForBusiness/
You'll get help from US CS agents who work for ebay. Many posts on this forum with their ability to be helpful.
Good luck.