Items delivered twice

I placed an order on 15 March for a new Explora and remote. The following day the remote was delivered. After several phone calls I was told that there was a problem with their new system and that the original order would have to be cancelled and re-done (minus the remote) so that the delivery of the Explora could take place. On Wednesday 18 March the Explora was delivered. On Friday 20 March another Explora was delivered. So I called them and told them to come and collect their second Explora that same morning. I was told someone from the returns department would be in touch. I called again on Tuesday 24 March to tell them to come and collect their Explora. I was told that someone from the returns department would be in touch (I'm seeing a theme). It's now Friday 27 March. I'm tired of calling them to tell them to come and collect their Explora.