Adt at there very best again

Here they go again. I call them to tell them there contract runs out with me the end of feb. not the other way around like a good business would do. Anyway I tell them to please send me an invoice every month from now on so I can make payment. I get an e mail saying I need to pay an extra 65 Rand for them to mail me the invoice ??? they can now stick it up where the sun don’t shine