Telkom charges you even though you don't have access to the services

I recently upgraded my Telkom contract and only received my device during the last week of the month. This was due to Telkom's own admittance that they hadn't given my address to the delivery company which caused the delay in delivery to me (I waited almost 3 weeks for the device). When I received my invoice for the month, I was charged the full device fee and the data fee was waived (because I didn't have use of it), though I didn't even have a week's use of the device for that whole month. When contacting the call centre (081 180) they informed me that it should have been stated to me when I upgraded my contract (which they didn't, otherwise I would've already had an issue with it) and that I will be charged the full device fee even if I get the device on the last day of the month. I indicated that I want to cancel my debit order and will then only pay to Telkom the invoice amount minus the device fee as I refuse to accept their response, here I was told that nobody can cancel my debit order as Telkom only works on debit order payments "as stated in your contract". When I asked for a copy of my contract they also couldn't provide me with a copy and indicated that I need to go into a store (and as we all know that is useless as you spend the whole day in line just to NOT get helped anyway). I find this outrageous and completely unacceptable!