Delivery time and no option to cancel

I paid for a Takealotmore subscription so I can enjoy the next day delivery benefit, oh well this is not the case as I ordered yesterday and my delivery date is the 25 of March.

I tried to cancel the order within 30mins of ordering and I didn't have the option to cancel. I was told to wait for the message of delivery or not accept the order as if this is not another big inconvenience already.