Atrocious lack of call centre assistance

As a apparently most valuable guest we receive two nights accommodation at sun city on a monthly basis. Once I receive the sms I immediately call as you only then MAYBE get the dates you wont however for the past two months the call centre is a DISASTER "with the usual "high call volume message" which seems to be any time of the day. Due to an emergency I was unable to get hold of Sun International to change my September booking to a later stage and f om the 6 of September I have not been able to book for October. Every call (of which 9 calls were made) I held on for a minimum of 10 minutes and the longest being 14 minutes but to no avail.??? I have spent more than 1h30 minutes on my vodacom account to try and reach reservations with NO luck? I must admit that if this is how you treat your MVG customers some serious market research needs to be done one the HOW