SPAR brand juice EXPIRED

I bought juice and I didn't know that it was expired I drank it but I noticed that it's bitter and later I felt the sores in my mouth and. My colleague dudu asked for the same juice I gave it to her so she noticed the date that it 29/03/2015<br> I called Glenda and she said I must go to the doctor to prove that I got sick from the juice I went to spar and spoke to bonga he took the juice promised to get back to me this morning I tried to call them but nothing until now.<br>