poising pepsi

I Purchased a 2L of Pepsi on the 14th of Feb 2023. After drinking some i realised something was very wrong with the taste. i sent a complaint. they rep**** and even phoned me to ask about the nature of the problem and offered a voucher for 2X 2L pepsi's. they also mentioned that i should keep the sample for collection to investigate. i expressed my concerns as to what the drink contained and have not heard from them since. i resent the whole string of emails and expressed my frustrations. still no word.