Casella Waste Systems review: Thieves - find a reputable company! Stay away!!!

O.K. I ordered a 30 cu yard. dumpster for $945.00 and $5.00 a day after the first 7 days. So, the total was $945.00 plus $250.00 for keeping the dumpster.
Cassella had my credit card information so they unbeknownst to me charged my credit card an additional $271.00. I didn't even know companies could do that. They said the dumpster was overweight. Well, the dumpster was barely half full, and it was light material like chairs and household waste. It had rained a lot, and I covered the dumpster as best I could but there was no drain in the dumpster. I suspect the rain at the bottom of the dumpster may have increased the weight, but they know that. They are thieves and they know it! I'm so angry that they screwed me.