Amazon sellers, is this true?

I had my order cancelled claiming my address was undeliverable (that’s BS), I attempted to reorder (half an hour after my order was cancelled) the item and notice the seller had jacked up the price by about 25%. I think they really cancelled because they raised the price, but they replied with this “Prices are updated automatically from time to time due to Amazon system settings, this is not something we have control over”. Is this true, or are they feeding me a load of crap?