Bad service

Brought my blackberry which is still under warranty to the Vodacom shop in Brooklyn mall the phone was switching on and off every 10 minutes . They were suppose to sent it to the repair centre in Potchefstroom which they did more than 3 weeks ago. the repair centre then phone the shop to let me know I must bring the battery as well which the shop never did I then went and gave in the battery. a week later I enquired with the repairs centre only to find my phone hasn't been given back to the repair centre I then went into the Vodacom in Brooklyn they **** and told me they sent the phone for repairs and that there is nothing wrong with the phone after telling the manager I have already spoken to the repair people he went to the back and brought my phone with him. am very disappointed with the level of customer service I have received. I have been with Vodacom for more than 10 years. The manager then called someone who told him indeed the phone software needs to be upgrade .As someone who works in costumer service I am very disappointed indeed. I am now without a phone for 3 weeks now. Hoping the matter will be resolved soonest.