LACK OF STOCK? BAD ONLINE SHOPPING

When I do my online shopping even after selecting my delivery address and it allows me to select items, pay for them and then to be told they are UNABLE to SUPPLY the ITEM I chose. <br> <br> And now when I login and check again IT IS STILL Available on your website for my area! <br> <br> <br> VERY VERY VERY VERY FRUSTRATING, ANNOYING and DISAPPOINTING. <br> <br> <br> And if the local shop doesn't have it then why is it not possible to have it sent from another???? (What is the point of the online shopping if it doesn't mean getting the stock required?<br>