Over charge and failure to respond

On 29Jan2024 I received a marketing call relating to a battery replacement. I specifically asked if this is the total inclusive charge and was informed that the charge of R505 is inclusive of all fees. Upon installation I received an invoice to the amount of R1155. I requested my call record on 31Jan2024 and have not received any response to date. I have followed up on 06Feb2024 and again on 14Feb2024. If my account is debited for the R1155 I will hold ADT responsible for any fees or bank charges for the reversal as I have been attempting to resolve this dispute since 31Jan2024.