Praise be to Allaah.
In order for it to be
permissible to use credit cards, it is essential that they be free of things
that are forbidden in sharee’ah, which includes the stipulation of a penalty
or additional payment for paying by instalments or delaying payment, as has
been explained in the answer to question no.
104244 and
116442.
It is also essential that
the fees for issuing the card do not exceed the actual costs incurred by the
bank. See the answer to question no.
97530.
You have done well to stop
dealing with this card, because it is not permissible for you to use it in
the situation that you describe.
In previous answers we have
explained that it is not permissible to use credit cards that impose
penalties for delay in paying even if the person is determined to pay on
time without any delay, because his entering into this agreement implies
approval of and agreement with riba, in addition to the fact that he may
delay a payment because he is travelling or busy, in which case he would
actually be obliged to pay riba.
As for the amount that they
charged you as the result of the employee’s error, the sin of that is on
them, and there is no sin on you in sha Allaah, because you did not agree to
it, rather you paid it reluctantly.
And Allaah knows best.