Product: Credit card

I applied for Priceline VIP Reward Visa Card and became a VIP member to book car rental and hotel room for XXXX XXXX trip on XX/XX/XXXX & XXXX, XXXX  with Priceline VIP Reward Visa Card. 
Per VIP terms, Priceline would provide best price guarantee or refund the difference when I found the cheaper price from other suppliers. 
I have two disputes with Priceline for " Best Price Guarantee ''. 
1. In the evening of XX/XX/2023, I used Priceline VIP Reward Visa Card booking 5 days ( XX/XX/XXXX XX/XX/2023 ) car rental in XXXX XXXX via Priceline by total {$300.00}. 
In the morning of XX/XX/, I found the cheaper price for car rental from another supplier, whose total price for 5 days ( XX/XX/XXXX XX/XX/XXXX  ) was only XXXX. The difference is {$87.00}. So, I immediately called Priceline and filled out request for refund on Priceline 's website. But, Priceline refused my refund request without a good reason. 
2. In the morning of XX/XX/, I used Priceline VIP Reward Visa Card booking 3 nights ( XXXX XXXX check in -- XXXX XXXX check out at XXXX XXXX  ) for one guest room at the XXXX XXXX, XXXX & XXXX XXXX. Priceline by total {$210.00}. 
Only a few hours later, I found the cheaper price for the same hotel and the same room provided by another supplier, whose price was total {$140.00}. The difference is {$63.00}. So, I immediately called Priceline and filled out request for refund on Priceline 's website. But, Priceline refused my refund request without a good reason, either. 
On XX/XX/2023, I disputed with Priceline a few times to request total refund {$150.00}. But, Priceline refused my refund requests by bad reasons. 
Since XX/XX/2023, I have been requesting my refunds from Priceline. Around end of XXXX and early of XXXX, XXXX, I sent my dispute to Priceline VIP Reward Visa Card company ( Barclays Bank ) to request total {$150.00} refund. But, Priceline VIP Reward Visa Card company ( Barclays Bank ) answered me that I had used the service. So, no refund to me. 
On XX/XX/2023, I faxed and mailed my refund request with the factual evidence to Priceline VIP Reward Visa Card company ( Barclays Bank ) again. But, Priceline VIP Reward Visa Card company ( Barclays Bank ) refused my request with different reasons. 
( 1 ) Insufficient evidence that the merchant has violated the invoice/contract 's terms or conditions.

( 2 ) We were not provided with sufficient evidence that the merchant has agreed to refund the account.

( 3 ) We are outside of the permitted timeframes to continue the claim through the dispute process.

( 4 ) We encourage you to continue to pursue credit by contacting the merchant directly, unfortunately, we can not assist you further with this issue.

The Priceline VIP Reward Visa Card company ( Barclays Bank ) ignored and distorted the facts that the merchant has not violated the invoice/contract 's terms or conditions. The VIP terms clearly state that Priceline would provide best price guarantee for VIP member. Otherwise, Priceline will refund the difference. The VIP terms have been posting on Priceline website. 
Moreover, Priceline are owned by Priceline VIP Reward Visa Card company ( Barclays Bank ). So, it's not strange for Priceline VIP Reward Visa Card company ( Barclays Bank ) always denied my refund request.