pathetic slow service from diesel online

pathetic service for diesel online. i bought items online on black friday 30/11/2019 up until today i did not receive my refund. they don't bother to even call a person to let them know that the items are sold out they just keep your money. i have been phoning and sending my bank statement because according to them they need your bank statement to do a refund. they don't bother to even check their email as i sent the bank statement numerous times. cant believe the pathetic service they offer from such an expensive brand. rather buy from a cheap company than buy from them.