Failure to update account details

I have been an Edgars account holder for many years. Recently I needed to inform them that my banking details needed to be changed as I was closing the original banking account I had. Going in to the store, I found out that there is no longer any customer services. Instead I had to phone RCS helpline to change my details. That too did not work and was told I needed to email RCS to inform them of my changes. I did this and asked for confirmation of receipt of my email - this never happened. I went back to another store and tried again. This time when phoning RCS from the Edgars store,I was assured my new details were processed. Well today I received an SMS stating that my account needs to be paid to avoid penalties. This means I have wasted my time trying to update Edgars, and so I will be forced to settle the account and close it. Why is it that such a simple process cannot be resolved?. Useless, *********** staff and complete lack of customer service!