Standard Bank International Banking - No Responses

I made an international payment from my Standard Bank account to an overseas company more than a week ago. To date the company claim that they haven't received the payment.

I tried calling Standard Bank International Banking on the 2 numbers they gave on their proof of payment email and both numbers say "the number you have dialled does not exist"

I tried phoning their general call centre twice and got put through to their International Banking dept and both times I hung up after waiting for 20mins without answer.

I've sent emails to their emails address and received no response.

How can one be expected to bank if you cannot get hold of anyone.

To date I don't know where the money has gone.