I have not received my refund yet

I was supposed to receive a refund of $43.03 for an account I closed over a month ago.  I received a letter stating that I would receive it within 30 days after I returned my equipment, which I did on April 7, 2026.  I want to know when I am going to receive it.  You keep sending me offers wanting me to come back but if this is how you handle refunds, I will Never come back to you and I will tell all my friends and family not to ever go with your company.