Billed for a full month when devices only received middle May

How the hell do you get charged the full amount for the Device Subscription fees on all 3 contracts when the devices was only FINALLY received on 16/05/2018 which is the middle of the month? I was told by Jabu from the Festival Mall branch, that I won't be charged more than half (actually less) than than my debit order amount for all 3 contracts, as the pro rata amount for May, yet for the phones alone, I'm being charged almost 60% on top of the normal debit order amount and another 20% for the tablet. We were never told by him from the start, to not use the data if the pro rata data ran out, so we incurred bills on top of this as well. I urge you, Telkom, to thus make good on your word and fix this Device Subscription Fee that I'm being charged for a full month on these 3 contracts. Let me hear what excuse you come up with now. I'm burning to hear it.