Bad customer service!!

I have tried unsuccessfully to utilise the Trade Debtor Account via the Makro online system. Trying to get hold of someone to help is a nightmare. I contact the customer care line and they give me the number for the Commercial Department. You ring the number given and it tells you that the mailbox is full and then cuts you off. I tried to ring the Head Office yesterday and the whole of this morning and it just rings and rings. I am at the end of my tether with trying to get hold of someone to help. The customer service in this country seems to be non-existent!!! Could someone from the Commercial Department please ring me to assist me with some 16 to 19 digit card number which has to be typed in. Actually, I would love to speak to the Managing Director or CEO of Makro as I am sick and tired of the slap dash service given to us. I am the buyer of 3 companies and should this issue not be rectified, I am going to speak to our management to have our accounts closed!!