Edgars and 3G Mobile let me down

I bought a cellphone at edgars,after a month the phone started to give me issues of slow charging and the battery wouldn't last a day,i took the phone back to edgars for repairs, it's been 3 weeks now when i call to follow up im told they will contact 3G Mobile and they will get back to me,but they never did,im so angry with edgars and 3G ,bad service