Bad customer service and rude management

I would like to express the poor customer service I have received from Ackermans Mega City mall in Durban. 2 weeks ago I bought a cellphone from Ackermans. I received a call from my friend who complained that there's an echo when he is talking to me. I did not tend to it since I thought it's network issue. As I received numerous complaints from people who were calling me I decided to go the store. Upon arrival I told to provide them with a receipt. I gave them all the papers they gave me and the guy said the receipt is not part of them. He was rude telling me that Iost the receipt but now I'm complaining. I told them to call the cashier who I paid to. The cashier acknowledged that sometimes the receipt where you sign does not come out sometimes.

This is the same receipt that states the warranty and the guarantee of the cellphone. I was never told that I only have 7 days to return it so that I can get a new phone. Now I'm being told that they will take it for repairs for one month. I told them that I use the phone for work so I cannot be without it. I was referred to a rude lady whom they claim its a manager. I told her that no one told me about the terms and conditions and there's no I never signed any declaration. She said I don't have a choice, it's either I give them the phone or I leave with it. She doesn't care that the in vital information was withheld from me. I'm using a cellphone with a factory issue and I cannot do anything about it. I would not recommend Ackermans to anyone because their employees are rude and they belittle people