DISSATISFIED CUSTOMER

I'm not happy about their service at all, at first I ordered a green P40 lite, I received a pink and blue phone, I accepted it anyway because my order took 2 full weeks... My debit order was set to run on the 16th of every month, I sent countless emails the 1st week of January requesting the debit order date to be change to the last day of the months... Guess what, after 3 days of trying to get hold of them with no luck, Uwais Khan came to my rescue he then sent an email that I should pay R235 pro rata amount for the debit order to be changed, I payed it but this morning I'm still receiving an email advising that I should pay my account as my account remains unpaid for the current month... Where did my money go to then? Why is the debit order not changed? Is my money not good enough, I feel that Rentoza has failed me as a customer and I feel that the 12 months contract that I took out with them is too long