TERRIBLE INCONVENIENCE MTN

On the 29/30th Aug 2024 I went on the MTN website to purchase the MTN starter pack home LTE for R269. I then filled in the online with banking details and address, I then got to the payment option which was R26 prorata fee + R269 advance payment for the coming Month, I paid that via debit card as that was the only option to pay, The router then arrived on the 2nd Sep to my work address, which i was Happy about and everything was and was working properly, then on the 6th of Sep 2024 I see that MTN debited my account of R269 which i was not prepared for so there was no money in the account now because there was now i have to pay bank charges for money that i was not prepared to go off my account. now i am liable for that, i then went to Instagram to query, they then asked me to send a screenshot of the payment that was made which i did, then i was told that month to month contacts are billed in advance which i know as per your terms and conditions, but that was not my issue, my issue is why was i billed a second time and on the 6th Sep 2024 that don't make sense. they then requested a PDF version of the payment, I then called your Customer care yesterday and they told me a different story that she can see my account is in a credit of R295 and i explained that that was the fee that was required for me to purchase the deal online, she then proceeded to tell me that my Debit order was set for the 15th which i was not aware of and i did not authorize because the website does not give you the option to choose a debit order date, because as far as i know the date you purchase the items on a month to month will become your debit order date, the agent then asked did no1 call to confirm these details with you and i said no, the only time i received a call was from a lady on the 30th to ask me about the payment and i told her i was waiting for money to be put into the account to make the purchase and that was all, so no one called to confirm any details with me so i dont know who authorised the 15th as my debit order date as i get paid on the 25th she then told me she can not change it as it does not give her the option to choose the 25th, which is now going to become my problem and an inconvenience to me now which i will not deal with so i need to it to be changed ASAP or else i am going to cancel this contract as it has not even been a week having this Service and i am already getting TERRIBLE SERVICE. Please fix this ASAP.