Sam's Club review: funds held

On 02/25/2021, I purchased $34.17 in gas from Sams' fuel station using an American Express Serve Card. Sam's held $100.00 of my money for a $34.17 charge. on 02/27/2021 the $34.17 purchase cleared, but Sam's continued to hold $100.00 from my card. This is wrong, if the $34.17 cleared why are they still holding my $100.00? I went to the customer service department to try and get answers. The manager, Tara Jessip, tried to say that maybe the $100.00 was for membership fee. I showed her the transaction on my phone and told her that the card company American Express said that it was Sam's that was holding the funds not them. MS Jessip tried to explain that some companies hold up to $100.00 for a purchase, but my question was, they hold 3 times the amount of the purchase? That is unreal Sam's and unfair. MS Jessip stated that it was not the local club, that it was the corporate office holding the funds. I have obligations that I have to take care of and not Sam's has added undue stress because of the hold on my money. This is not right! Club #8236