I've never had a problem with them.. but did have a few months of problems with Wall-Mart.
I work a night gig, and get out some nights at 11:30pm.. I drive right by a super wall-mart on the way home, and sometimes stop and shop. I always pay by discover at wall-mart ( cash back ya know! ) and it seems like whenever I would check out within 10 minutes of midnight ( before or after..) that the charge on my statement would be doubled. And then one credited back. This became a hassle, as in a month.. I might have been to wall-mart 5-6 times.. and I had to keep up with the credits.. it also became a hassle when the statement cutoff time/date was cutting off a credit.. So.. I would have double charges.. but the credits would not hit till the next statement.. In effect I was having to pay the extra charge.. and then I would have twice that amount as a credit on my next statement... I called the store, their corporate accounting office.. many many times.. managers.. etc.. I got tired of it.. and called discover. They suggested i dispute it the next time it happened. ( Not dispute it to not pay for the original purchase.. just the screw-up.. ) As usual.. the next statement had many such occasions of this, including one of those carried ballances, and I did as discover suggested, and disputed those charges.. Discover was very helpfull the whole time, and said that what wallmart was doing was really a big no-no. ( the doubled charges that had the credits coming in on the next month ).. I did get one sort of nasty call from wallmart one time, and told them what was happening, and refered them to discover.. I called discover and told them what happend, and they apparently got right on it and contacted wallmart.. then courtesy called me back to let me know that whoever called me with the bad attitude I guess.. was probably now looking for another large chain store to work for... And since then.. my billings have never had that happen again... guess somebody got it fixed...
Soundguy