Sandisk Ultra 64GB can't be formatted or permanently altered

I am happy to say that when I reported to Sandisk my problem with this card and the umpteen measures I’d taken to try to deal with it -  unsuccessfully - they very quickly accepted that the card is faulty and sent me an RMA to return it for replacement. Given that things in this world do go wrong some times, I am impressed with their response. Though I do still think it would be good if what appears to be a known problem with this card were better publicised.