Unwanted debit order

got a call from one of your agents because I did want a phone, they asked me a few questions which I was said to answer yes to all of them. I did so, now there’s this benefit called My Tech Zone. Before I have even received the device I have received a message saying that I’ve subscribed to this my tech deal and my biggest fear is before I even receive the phone I’ll have a debit order. More to this, I’d like to cancel all pending orders under my name.