Unable to upgrade contract!

My telkom mobile cellphone contract is due for upgrade since 1 Oct 2015, Since then, it is going on the third week the telkom store in picknpay centre are not able to get new stock and I tried to phone the 10213 telkom number for upgrade over the phone but twice I was sitting and waiting on the phone for 30mins each time without anyone answering the phone ever. That is truely pathatic that it is so difficult to just to upgrade a contract phone.