RCS service just keeps declining .... No option but not to use the cards anylonger!

I am so disappointed in RCS service, I have been struggling now for 4 months with my cards being declined in store, there is enough credit available, they sometimes advise me that it's an old card but then want to charge me for the replacement of the card or they say its a suspicious purchase even though i purchase at the store regularly... It so embarrassing... The agents are not actually interested in finding a solution so it seems i should just cut the cards up and when the account is paid up rather use other services! After been a client for over 10 years this is really Pathetic