Vodacom Hartbee****rt

I upgraded my contract 23/01/2020. I asked for the Samsung S10 and was adviced it is out of stock and she suggested S10 note. I used the phone and are not satisfied due to some reasons. SA i know from previous contracts there are a 7 days cool off period. I phoned customer service to confirm if i could return the handset for S10 as originally wanted. The confirmed yes 7 days with original proof of invoice and if phone is in the same condition. I asked for reference number as i was previously warned about the terible service at Vodacom Hartbee****rt. When i went to the shop i was treated disrespectful and the Manager Belinda said it is not there store policy end of story NO COOL OF PERIOD. After explaining about the call to customer service the contract was slammed down on the table and she instructed me to read????? Really how can stores, and the Vodacom website have double standards. I have been a client of Vodacom for over 20 years but after yesterdays insidance i am not sure any more