Sony Ericsson F - 305 — defective cell phone

My self Subhash b dangi I have purchase sony ericsson F-305 on[protected].
On[protected] mobile was hanged and giving white display ,I have submitted the phone to sony ericsson gallery at ghatkopar(Mumbai)(shop no 113,1st floor platinum mall).workorder number-se309cs210710.
Compare to another sony ericsson phone camera clearity,working of phone was very very slow.
After 36 days the phone was repaired and I have collected on[protected] after 4-5 days another problem occurred slider problem and phone get slow while using and then again I have submitted the phone to the same gallery on[protected] workorder number-se309cs211267.
After calling to gallery on[protected] they are saying that parts are not available till[protected].
On 17th of dec they will give the phone.
My question is to sony erisson is that i[censored] are having capacity of making the phone why u are not making the part of that particular phone sorry to say that bocz I was just fan of sonys phone camera ,working fast but this phone is just like a daba phone.i am very sorry to say that it is ture.
Pls sir, if it is possible to replace the phone thankfull to u
Bocz in 8 months 2 months have gone to repair of that phone and how much it will take I don”t know.
Plz sir solve my problem as earlier as possible or replace the cell phone.
Thank you.
subhash b dangi---[protected].