ACDC Dynamics Terrible Service Received

I ordered some items from ACDC Dynamics about 6 weeks ago. I stated that in my order I wanted 12V items, was charged for 230V items but I didn't see that the invoice stated 230V. I paid and was sent the wrong items, an oversight on my part I admit.

So I contacted the consultant that helped me and asked if could exchange it and was instructed to return the items for credit, which I did. I tracked the items using Courier Guy and it arrived at their returns department four weeks ago.

Since then I have sent emails to sales and returns, I have called their sales and returns department to no avail. Every time I am told that they'll get back to me but they simply don't.

I have sent a message on Facebook, was again told they'll get back to me, today I phoned their customer service department was told they'll get back to me today, I'm still waiting...

I didn't want to resort to Hellopeter but I'm fedup. All I want is to be credited so that I can order the correct items and have it sent here but having to wait for 4 weeks with zero results is ridiculous and I need the items urgently... And I don't want to be asked for the invoice number again, ask the consultants in your sales, returns or customer service departments, they know about the issue and have the relevant info already.