Refund and adjustment needed after debit order increased erroneously

My debit order has been increased by R21 for January and now February. This was after I received an email on 9 December 2022 about the increase and then one saying the email about the increase was in error on 13 December 2022. The email said it was not yet my contracts anniversary. My contract number is *** at Virgin Active Richards Bay . I need my R42 back and kindly change the debit order amount back R390 (3 children R130 each). I informed the consultant at my gym club but they said I should phone the call centre. I don't have the airtime to make that call.