Sainsburys Home Delivery

I am disabled so rely on home delivery for my shopping as I am unable to carry my monthly shop home, and I do not drive. I had been using Sainsburys for quite a while when on one occasion after shopping online I paid using my credit card and arranged for delivery four days later. The delivery day came and one hour prior to my delivery Sainsbury's rang to inform me that there was a problem with my card and as such they wouldn't be delivering that day. I said I had the money for them in the house if their is a problem with the card, and "No, our drivers aren't insured to carry cash" So fuming I told them not to bother I would spend my money elsewhere, with that I logged onto Tesco's website and ordered my shopping with them using exactly the same credit card and it was delivered the following day! Absolutely no problems or any questions about my card at all as it appears that Sainsbury's system is flawed. I wrote to them complaining that I thought their was a problem with their system, they replied by offering me a measly £10 off my next delivery! Incensed at their blatant disregard for their customers I flatly refused such a punitive offer, to get home delivery costs £5 anyway! Will never use such a dickensian company again, their loss is Tesco's gain.