Not getting statement credits from "Buy one Unlimited line, get one Unlimited Intro line FREE for a year" offer

I activated two lines back in October 2023 but I am not getting the statement credit from "Buy one Unlimited line, get one Unlimited Intro line FREE for a year" offer.

• I chatted with customer service through xfinity assitant on 9/28/2023 to confirm the "Buy one Unlimited line, get one Unlimited Intro line FREE for a year" offer before I placed my orders. 
• I ordered  two unlimited lines one on 9/29/2023 and second one on 10/2/2023. The orders are placed on different days because that was what the xfinity assistant suggested during the chat; one of the phones I wanted was out of stock at the time of the first order. 
• I activated the 1st line on 10/8/2023 and activated the 2nd line on 10/17/2023.
• At the time of the orders and activations I did not have any active lines and I was a xfinity internet customer more than the 90 days, which was a requirement for the deal.
• I did not get any statement credit through "Buy one Unlimited line, get one Unlimited Intro line FREE for a year" offer in October 2023, November 2023, January 2024. I contacted customer service multiple times.
• Initially I was told that statement credit from "buy one unlimited line get one unlimited for free for a year" offer takes one billing cycle to reflect on the bill.
• Since activation I had numerous attempts to explain the situation to customer service that I am not getting the promised credit from the deal. In one of my attempts, the customer service agent was able to elevate my concern and they manually applied $30 credit to my bill in December 2023. I was told that "The promotion might not have added due to a system error".
• In my other attempts I was given different reasons such as my account was ineligible for that offer; one time I was told that "the orders were placed on different dates therefore the discount could not be applied". Another time I was given an escalate number [Edited: "Personal Information"].
• Only on two occasions the xfinity customer service was able to manually apply $30 credit, December 2023 and February 2024 and I was told that upcoming statements should have the credit applied.  
• On February 12, 2024 I was asked to schedule a call with Xfinity customer service. The person I spoke to said she issued refunds for the months where $30 credit was not applied. She said it would take 5-10 days for the refund to be reflected on the credit card on file, she also confirmed that the promotion will be applied for the upcoming statements. I was given another case number "[Edited: "Personal Information"]". 
• Today, March 3rd, 2024, I followed up on the case number over the xfinity chat assistant. I was told that it's still in pending as off now as the promotion is showing error. Now, my new statement is ready and I do not see any credit applied nor I got any refunds that I was told on February 12, 2024.