Vodacom 4U Store in Clearwater...TERRIBLE SERVICE IF NOT THE WORST!!!!

I went to the Vodacom 4U store in Clearwater on the 1st February to do an upgrade on my cell number *** and choose the Samsung S6 Edge. I was not happy with the battery life on the device and returned the phone. I swapped it for a Huaweii P8 phone. I did not recieve any paperwork for my new upgrade and have requested for this a few times from the store..... Two months later on the 8th April 2016 I was slapped with a debit of R6600-05 on my Vodacom account for the equipment.... I contacted the Clearwater Vodacom 4U store immediately with this query. The consultant Sady that dealt with my contract was on leave and her manager Ronel then took my query and said she was going to get back to me.....I AM STILL WAITING!!!!!!!! It is now another month later. I received an SMS on the 3rd May from Vodacom that I need to pay an amount of R7573-01 within 5 days????? I immediate knew that this query was still not resolved. I called the 4U store again and asked for the manager Ronel who took my call, but handed the phone over to Sady.... explaining my query again to her. I also called Vodacom *** to assist with this query. The *********** staff from the 4U store has still not called me back........ I have never in all my life experience such BAD SERVICE!!!! I hope someone from Vodacom Head Office can assist me in sorting out this problem once and for all.