Unreachable RCS

I had an error in store where my card declined. I was sent to back of store where it was replaced and finally it work after a long time. 2 trip to Game and again the new card declined, they check and a stop was placed. After 30 of RCS not answering we left the store without the goods. Now we trying to get hold of RCS wasting 40min of my time and airtime and they still dont pick. We dont know why stop was placed and was never called about it. Does the call center even work cause spending so much time and effort to get through is ridiculous