No discount for paying early!

We were supposed to receive a discount as we paid our yearly fees early (by September). However, since then Flexi Club has repeatedly contacted us to pay "arrears" that are in fact the discount we received. We have spoken to countless call centre agents about this and despite their promises, none have apparently been able to resolve the issue. The most recent conversation we had was with a lady named Zintle. We've have been loyal members for twenty years. This service is appalling.