poor service from vodacom

In May 2019 i entered into a 24 month contract with Vodacom Chatz Midlands Mall on a special they advertised for a Samsung A70 cellphone with a Samsung watch an power bank. On arrival at the above store i was told that there has been a error in the pamphelt and the deal does not exist. After me telling the consultant that it does not state anywhere on the pamphelet that it is a mistake, the consultant then agreed to give me deal. After going several times to the store, finally after 2 weeks I recieved the watch. Within the last to 2 months i have been to the store on countless occassions enquiring about the powerbank which was part of the deal but i had no luck. Finally last week i recieved a powerbank but yet again is a problem as it is not compatable to my A70 smartphone. I cannot understand the reasoning behind giving me something that is out dated. The staff at the store give me a blank look when I ask them about it or is it just that they want to keep the real powerbank for themseleves.I am so fed up with the service received at this store.