When they owe you money they're slow but if you owe them, you'd better be quick or they make you pay interests, at least that's how it works in France, IE here.
Yeah, that rings a bell. In one case, we paid them in time, but they misallocated the funds and kept demanding we pay them (with interest). We'd sent the proof of payment several times showing all the description, but still said they hadn't received it. They sent us several fines, but eventually found out where they had put the receipt. That was mildly annoying.