Worst service by a horrible receptionist

I have received the worst service from Osman's Optical in Lambton : 123 Medical Centre. The receptionist gave me a call during a skype meeting from work (that she could clearly hear from the background) and told her I would call her back, but she still insisted that I talk to her (her exact words, "but ma'am you have answered the call already"). I hang up and continued with my meeting and called her back, she answered the phone and demanded that I need to pay the outstanding monies that are due. To explain in detail wrt the outstanding monies, I went it for an appointment and the kind optometrist assisted me and at the end of the consultation the optometrist told me I would have to pay R180 from my end as the medical aid was going to pay the rest. The turnaround time to collect my glasses had passed and when I called to check if the glasses were ready for collection I was told by another receptionist that I have to pay +- 2000 grand (I stand to be corrected here as I cannot recall the amount). The main issue here is not wanting to understand the reason why the balance is still outstanding and also let's not forget that the outstanding balance was due to a miscommunication by the practice.