no stock and very poor service

i was at the drive through and ordered a zinger burger and zinger box master and after waiting 10min they told me they don't have zinger fillet i asked for a refund but they were not willing so they gave me a normal burger and normal box master and this is not the first time they have treated me bad about 3 mounts back i order breakfast burger from them and a cappuccino and then you pay R10.90 for the cappuccino instead of 14.90 because its a meal then when i got to the till i told them they charged me the wrong amount and she told me she cant open the till to refund me my R4