Interest added on Edgars 6 months no interest account

Since a few months ago I have a big problem with Edgars and the account. I retired at the end of May and pay my account every end of the month when my pension is paid. Edgars now added for a few months interest on my account. I sent e-mails to their accounting department and do not get any feedback back. I pay my account even in person and still interest are added every month! The account I have I had since 1975 and never had these problems! It is ****************!!! This is a 6 month no interest account or should be. Really disgusted by Edgars