i returned a tablet for repairz its been months now

i bot a tablet abt 4 mnths back within a month it starting switching on and off on its own i returned it it turns out my tablet was the 13th in the list of malfunctioned verssed tablets .fine i was told to wait fr eir call but its 2months now still no call i went to check last week .the hostile attendant told me not to bother them they will call me when the suppliers have repaired the tablet she said i shldnt complain some have spent 3mnths without.Now im going home for the holidays without a phone I paid for fully ,i dnt how long ill wait .Bt really why do u sell a defaulted brand n then make us wait months an months without our goods i paid for it and y does it tek long i hv tekn fones to repair n it tuk only hours to finish y do ey tek long.tats nt fair i hv rights i think u violating them pliz do something im supposed to b home next week