Disgusted with Adida customer services

I logged a return on 20 April for a shoe size that was too small. The shoes were collected on 22 April, Adida confirmed that they received the shoes in their warehouse on 02 May 2025, however, to date I have not received my refund. After numerous phone calls and emails, they keep making empty promises. A month ago, I was informed that I sent the wrong shoes, however I purchased 2 pairs, an 8 1/2 and a 7, I returned the 7 and still have the 8 1/2. To date adida has not attempted to make contact with me. I have to constantly call them and every time I deal with someone else. They also don't have a manager that I can speak to. I've purchased a lot from Adida before, this is the first time that I have been disappointed like this. The service is absolute pathetic, and I am truly disgusted. It is almost 3 months later, and I don't have my money or the shoes.