Unless you arranged for extra service, there should have been no charge for the T/T on day 4.
If you did not request the extra service, you may want to challenge the charge on your bill. (I'd really urge people to question these things while still on site instead of later-as it's an easy thing to correct on the spot.)
I think an error was made in your case and can probably still be corrected. Call the resort directly and have your bill handy for the reference numbers.
There should be no charge for the service automatically provided (Trash/Towel on day 4 for stays of 4 to 7 nights and/or Full Cleaning on day 4 and T/T on day 8 for stays of 8-11 nights.)
Good Luck!