Builders Warehouse and credit card administration failure

I opened took out a credit card with Builders Warehouse to make to make my shopping more convenient in-store. On 21st August I did 3 transactions in a matter of less than 30 minutes which sometimes happens when I forget something that I need on site. I made the 2nd transaction to which I received a phone call from RCS doing a security check on the account. During the conversation the operator seemed more interested in her colleagues conversation than the call we were on. I then made a 3rd purchase to which I received another call from RCS doing another security check. I told the operator that I had just had the same conversation ith her colleague to which she cancelled the call. 2 minutes later I get a message from RCS that due to suspicious activity on my Builders Card they have blocked the card for my protection. I rep**** to the message to correct their error to which there was no answer from the switch board. I then called the service department when I held the line for over 10 minutes. What a waste of time when I am trying to sort out their arrogance and mistake. Still cant get through to anybody