Hello,, due to frequent taking,, or due to taking tablets for longer periods,, or improper dosing or not taking full course will cause bacterias to become resistance to antibiotics and antibiotics will not help. In this case higher dose antibiotics or antibiotics from different group (not same group, like penicillin, cephalosporins) to be given. Consult a ENT specialist he will prescribe you that. Do salt warm water gargling daily thrice,, avoid cold foods or items, to relieve tonsillitis faster.