Im being treated badly

Hello I've received a message like this "Good day, kindly note your termination is back dated to the effective date 30.06.2024 due to resignation, any claims after this date is member?s liability. Gems"

While I've sent an email like this " Hello I Thabang Fortunate Tau with ID ***.1 am writing this email to GEMS. To state that i have put a resignation letter today 1st of July 2024 till the last day of the month of July 2024. I am also letting GEMS know that i am also notifying them that I want to terminate the medical aid month end of July 2024 which will be a full month notice from today 1st of July. As spoken to one of the GEMS agent I was told that I'll be covered for the whole month of July 2024 as from the 1st August 2024 I won't have cover? Please revert back to me. Thank you " it was sent on the 1st of July 2024.

So i dont understand what he back-dating thing hence your call agent adviced me to write an email like this.

I was trying to be a good person by notifying you guys but honestly I could've just kept quiet if this how i am being treated