Hi and thanks for the query,
Persistence of this symptoms after anti biotherapy could indicate either a resistance of the causal infection to the drug, a viral origin which certainly shall not respond to anti biotics, another non infectious cause of painful swallowing. I suggest you get a reevaluation by an ENT specialist
to rule out all these possibilities. It could be a good idea to carry to carry out throat cultures and anti biotic sensitivity tests.This shall be very important in tailoring treatment to a specific causal agent thus enhancing the possibility of therapeutic success. Excluding other causes of painful swallowing rather than bacterial infections could be a great gain during the evaluation process by your ENT specialist.
Thanks and best regards,