Good Customer treated badly

Spent two days trying to buy my sister from Inverness Scotland a gift for her 70th Birthday online for 25th February. But they would not accept my Mastercard. I eventually phoned the bank on the second day and had to answer a numerous stupid questions. Then after holding on forever was told it was your bank that put my card on hold because of *****. I do appreciate you looking out for us but can't the bank phone me on ********** 310 to ask if it is actually me doing the transactions? It was an absolute nightmare and now she will probably not get the gifts on Monday 25th thanks to you. This also happened to me when we were on a cruise on the MSC and wanted to book the next cruise on the ship but they would not accept the R3000.00 Deposit. It was very embarrasing. Please look into this matter and change your policies. I have a very good credit rating so why do I get treated in this shoddy manner? Karen Schafer