cellphone problem

I am having a complain with Ackermans cellphone, i bought a PremioP500 in April, and in September it was not working, it keep on having a pop-up message that storage space is running out, i have deleted all my my apps, but it is sill not working, I have lost a slip but I still have a box with IME number, have been sending messages to ackermans customer care and I dont get any joy since 16 Sep, i ve been communicating with Chad, he promised that he has escalated my query and cellular dept will contact me within 5 working days, but no one has contacted me yet, i bought a second cellphone Hurricane in May with account, it is also not working, it is not charging, i tried to get a new battery at ackermans, i was told that they dont sell battery for that phone I must return it with everything that i bought with, and i dont have all that, I have learnt a lesson not to buy cheap cellphones that I don't know, because Im stuck with 2 cellphones that are not working yet they still under warranty.