Medicross Constantia - Dr M Strydom - unfair charge

My son was referred by a dentist to Medicross Nelspruit to get Rociject antibiotics which consists of three applications by drip about 24 hours apart. Although the doctor spent 1 minute with him, I had to pay his consultation fees. I've accepted this as this is normal as far as I know.

However, the third application of the medication after 2 days could not be app**** in Nelspruit as he went back to school in Pretoria. I've asked the Nelspruit doctor to give me a reference to get the last application at Medicross Constantia in Pretoria without having to pay for another consultation again. However, at Medicross Constantia they refused to give him the last dose without a consultation. Even with the instruction letter from the doctor in Nelspruit where I've already paid the consultation fee. I had to pay for another consultation. The Medicross Constantia doctor (dr. M Strydom) did not spend a minute with him and charged for a full consultation.