Cancelling or deactivating a theme that is totally unuseable for what it promised

I’m so angry and frustrated with this theme, I would like to get it deactivated and cancelled so that I might be able to get my website working with yet another theme and not one from this site !!
Can anyone tell me how to get this done as when I lodge a support ticket, I’. asked to set up an account, yet again, provide the purchase code, yet again, give the reason for my request, yet again and the list goes on and on !!
Please help me so that I can get this Classiads theme deacitvated, cancelled or whatever it is I have to do to get rid of this heap of rubbish. My web designer has request so much assistance, and gotten nowhere with any replies or help, and I’ve paid so much money out now, I’m over it !!

You can try over