Worse Service at Vodacom Gateway

I took a cellphone contract with Vodacom on the 14 December 2018, and on the 17 December 2018 I tried to cancel the contract the store manager at Vodacom Gateway was very rude, he refused to cancel the contract. He said I can do anything. Nobody can touch him. When I showed him the contract says I can cancel within 30 days. When I called Vodacom customer care. There said there can’t help I need to go back to store. Worse service ever at Vodacom Gateway. The store manager even chased me out of the store.