Debonair's Pizza App arbitrarily changes client's order instruction

Debonair's Pizza App arbitrarily changes my order instructions. I placed an order using the App on the 16th April. I gave the delivery address but the App changed my instruction for delivery to the instruction that I was to collect the order. Numerous attempts to phone both the store and the national helpline to query resulted in calls not being answered, dropped and promises to phone back - which never happened. On my 4th attempt to phone the store I was transferred to a different store who transfered me back to the correct store. Debonair's quickly takes my money but does not follow through, and trying to phone to query is extremely difficult. Further research informs me that in Pietermaritzburg delivery orders are supposed to go through one particular store and all other orders default to Collection. But this fact is not clearly communicated. Why not default to the store which does deliveries when this is cleary the client's wish instead of inconveniencing your client by changing the order to Collection? I am very dissapointed in how I was treated by Debonair's. I ask that Debonair's explain what happened, and fix their App!