diff --git a/home/utils/rebate_bills_saver.py b/home/utils/rebate_bills_saver.py
index e730140..c21409f 100644
--- a/home/utils/rebate_bills_saver.py
+++ b/home/utils/rebate_bills_saver.py
@@ -59,7 +59,7 @@ def save_short_bill(student,period,days,high_tea,caterer):
 def save_long_bill(email,days_per_period,j):
     student = Student.objects.filter(email=email).last()
     for period,days in days_per_period:
-        if not isinstance(period, QuerySet):
+        if isinstance(period, Period):
             rebate = StudentBills.objects.get(email=student,semester=period.semester)
             allocation = Allocation.objects.get(email=student,period=period)
             catererBill = CatererBills.objects.get(caterer=allocation.caterer,semester=period.semester) 
diff --git a/home/utils/rebate_checker.py b/home/utils/rebate_checker.py
index e236650..a36eb54 100644
--- a/home/utils/rebate_checker.py
+++ b/home/utils/rebate_checker.py
@@ -12,13 +12,13 @@ def is_not_duplicate(student,new_rebate_start,new_rebate_end):
     """Checks if these dates are already applied for rebate"""
     try:
         for short_rebate in Rebate.objects.filter(email=student).all():
-            if (short_rebate.start_date-timedelta(days=2) < new_rebate_start<short_rebate.end_date+timedelta(days=2)) or (short_rebate.start_date-timedelta(days=2)<new_rebate_end<short_rebate.end_date+timedelta(days=2)):
+            if (short_rebate.start_date-timedelta(days=2) < new_rebate_start<short_rebate.end_date+timedelta(days=1)) or (short_rebate.start_date-timedelta(days=2)<new_rebate_end<short_rebate.end_date+timedelta(days=1)):
                 return False
         for short_rebate in LeftShortRebate.objects.filter(email=student).all():
-            if (short_rebate.start_date-timedelta(days=2) < new_rebate_start<short_rebate.end_date+timedelta(days=2)) or (short_rebate.start_date-timedelta(days=2)<new_rebate_end<short_rebate.end_date+timedelta(days=2)):
+            if (short_rebate.start_date-timedelta(days=2) < new_rebate_start<short_rebate.end_date+timedelta(days=1)) or (short_rebate.start_date-timedelta(days=2)<new_rebate_end<short_rebate.end_date+timedelta(days=1)):
                 return False
         for long_rebate in LongRebate.objects.filter(email=student).all():
-            if (long_rebate.end_date+timedelta(days=2)> new_rebate_start>long_rebate.start_date-timedelta(days=2)) or (long_rebate.start_date-timedelta(days=2)<new_rebate_end<long_rebate.end_date+timedelta(days=2)):
+            if (long_rebate.end_date+timedelta(days=2)> new_rebate_start>long_rebate.start_date-timedelta(days=2)) or (long_rebate.start_date-timedelta(days=2)<new_rebate_end<long_rebate.end_date+timedelta(days=1)):
                 return False
         return True
     except Exception as e: