This indicates the need of another antibiotic. Te rule to change over to another antibiotic if it does not work is an universal rule. You may request or insist the Doctor for this and for a course of 1 to 3 weeks of antibiotic and supportive course. This may help to avoid surgery.
The another rule is more than 3 attacks of tonsillitis
in one year is an indication for tonsillectomy
But with the advent of better and newer antibiotics the need of tonsillectomy has becoming less and less.