Useless after sales for Russel Hobbs

I purchased a brand new king electric blanket in one month both controllers packed up. It was easier to buy new controllers rather than book the blanket in. I was promised delivery in 4-7 working days it's been 13 days n no product delivered. I paid for delivery as well. After numerous emails and WhatsApps the agents blame me for not understanding that they are busy with stock take. I did not receive my email to say the part will be delayed due to stock take. I run a business of I'm late I will apologise in advance. I requested a refund on the delivery fee but they refusing to refund me even though the error is on their side. Il never buy a product under the home of living brands and that includes Russel Hobbs. There aren't even any managers to contact me n take the fall for their useless error n service.