Asda Stores review: Charging after a cancellation. Advised no charge but funds gone.

I cancelled a grocery order with asda a few hours after midnight the day before an evening delivery and resceived an email response saying I had not been charged. This I found to my cost this was a damnable misrepresentation. I had gone down town to get my £40 mot and was told my debit card had been declined! I was humiliated. I went online to look at my bank account and found £38.02 was in the paid out column leaving me with less £2 available!
I am 79 years old in sheltered housing with heart problems, cancer and spinal trauma and find myself denied funds I desparately need.
I rang so called customer service and was asked to do a print screen of my bank statement to email back, which I duly did. I was told they would ring back. They did not ring back! I rang again the next day after hanging on for a long time and talked to a person called tanya who was very snippy and told me her manager was not available. She told me the transaction had been authorised. All this was not doing my heart any favours on the day my medication was being assessed. I may now get 10 months of overprescribed medication. I am now in a state of extreme anxiety.
I have had many problems with asda and it is no wonder walmart have got rid of them. I cancelled a future order and have to wait for god knows how long to get my money back and hope my car is not carted away to the crushers in the meantime.
Please... Never use asda again if you can avoid it. I now use iceland which is a far better run company and I can always get an early delivery the next day and the quality is far better and mostly cheaper.