At the end of November, I ordered a gas hob which was delivered but they also gave me an oven I didn't order.?

At the end of November, I ordered a gas hob and electric double oven from an online retailer. They were scheduled for delivery on 4th and 12th December respectively. On the 4th December came, the Hob was delivered but there was also an electric oven. Believing the oven to have been delivered early, I signed the delivery. I later realised that the oven was not the one I had ordered and (it was single) and my double oven was still scheduled for 12th December. On checking the label, the oven was for a completely different person and had been sent to me in error.

I contacted the delivery company but they refused to collect as the delivery postcode on the label did not match any of their records. I phone the company I purchased from and they said they would arrange a pickup the next day. The next day, no pickup. The next morning I chatted online to the company who said pickup would be arranged for that day......no pickup. Its now been 5 weeks so what should I do with this oven ?