GREE SA poor service

I am in the air conditioning business for a long time and never have i had such a bad experience as i had with GREE SA Air conditioning. It seems that GREE SA only has one person dealing with parts,after several times calling to inquire about parts i need for my client and leaving my contact details every time they just does not return call. Then the person will be in shortly , then the excuse is he just when out, and hours later after I call them back the person is not in for the day. meanwhile i must deliver a service to my client with this kind of back up from suppliers like this?

On my last call and conversation with the lady that answers I told her that i will never promote GREE to any of my clients, She rep**** " It's OK" . Now how in the world is this "OK". Sad part also is that i have called on Other braches numbers that i found online and the same lady answers and ask that you call The 011 number which she answers.

If any of GREE agents has beter experience Please i would like to hear from you.