Activating fibre service before requested date, not willing to credit account

I app**** for fibre on the 10th of May and asked Afrihost that installation etc must only take place on or after the 28th of May. On the 11th of May at 02:16am I received an sms saying my fibre has been activated. My account was debited for the amount of R404.42. I asked Afrihost to deactivate the service until the 28th as I have asked and then credit my account for that amount. Now it seems they don't want to assist with this and it is Afrihost's fault, as they didn't honor my request for the installation dates. I am the client, I am right, so please honor my request (NCI-***9) and credit my account and activate the service as requested.