shocking service

shocking service. i app**** and was approved for a pnp store account. i got my card and for 2 weeks i used it and no problem. then week 3 it declines my card saying no credit account. this after i had just paid 4000 into the card and still had a large limit available. call the call centre and they say all sorted. next week again same decline. i call them from the store and for over and hour they try different things and even tell me my card is damaged and issue a new card. still no luck. card wont work and i am again embarassed. agent tells me a manager will call me monday. still holding my breath. absolutely useless service.