my phone was over due for collection and no one ev

my phone was over due for collection and no one from MTN bothered to call me. after 6 months i call t find out what happened to mt phone then i was given a large bombastic word which i didn't even understand. i am very disappointed never thought that MTN would do such a thing. I first handed it over to MTN Vaal gate where i was told that there is nothing wrong with my phone, then took it to MTN Meyerton were thy told me that the battery was dead and i should charge it when i get home. when i got home my phone was still not switching on. i then took it to Southgate were i got good assistance. i was made aware of the matter and everything was communicated to me. i was given the technical departments numbers were i was continuously called to find out abut my phone. at first they wouldn't pick it up on the system then i was promised to be called back till two day ago when i called and was told that i will not be able to get my phone cause 90 days have passed and i was in a shocked state because i was not called. how do we deal with such tho?