My samsung GT C3312 can't access to the internet anymore !

I bought this phone for like 3 months now and it has Wap/GPRS ..
The first time I configure the internet mobile I star searfing the net easily.
But it began from the last Thursday , when I try to connect to m.facebook it won't appear.
It always load and load than a message apear to me and say " No response"
I called customer Service but they didn't help me a lot .
That make me crazy my phone is fine as my sim card and always I have balance.
Please help me and thanks :)
Asked Feb 09, 2013
Edited Feb 09, 2013

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