Rude manager

On the 13 Jan 2018 I went to the dentist in krugersdorp after they visit my sons school. To cut the story short. The work was done by the dentist and the dentist asked me to make payment at the receptionist. The receptionist charged me R1300 to fill in my sons one tooth. So I paid using cash. I asked for the receipts the same receptions told me she will email it to me as she needs to do administration related to my account and their systems are down . So I gave her my email as per her request. A week and half passes without the receipts. So I phone the dentist office to remind them about my receipt. The receptionist who was assiting me was off but her colleagues marga sent me a receipt with R1000 not what I paid. So I told her the amount on my receipt is incorrect. She then told me they will investigate. I had to call them for over three days asking for the correct receipts. Finally I spoke to the guy who identified himself as a manager for the centre . He accused me of lying that I didn't give her receptionist R1300. They refused me to speak to the owner. This is the last opportunity for the owner to listen and come back to me. Failure to listen to my plea for the correct amount on my receipt will leave me with no choice but to escalate the matter with consumer unit and ombuds office or to seek legal recourse . I am not doing this because of boredom but matter of principle. I don't see why I would complaint for the amount to be reflected correctly can harm anyone. The manager of the centre was shouting as if I am stupid or I am asking for credit. He said I was harassing his staff. I have recorded all of my conversation and that accusation won't stand anywhere .