A Promotional Outlet apromotionaloutlet.com Order took forever and was over-charged New York, New York

We placed an order with A Promotional Outlet online for coasters.  The coasters were listed on the website as a set of 4 for $25.  So I ordered 5 sets.  I had to send them repeated emails regarding this order because it was never coming.  I was told 7 days for processing.  The order took almost 6 weeks to arrive and when it did I got 5 coasters total.  Not 20 or 4 sets like I had ordered.  I was also charged an additional $10 and they refused to give me an official invoice even after I asked repeatedly for one.  I contacted the company thinking they would rectify the error since it was listed on their website as 4/$25.  They admitted that it was listed wrong on the website but refused to provide me with the additional coasters for the original price quoted.  I would have never order these coasters if I knew they were $25 each!  They offered to send me the rest of the coasters at half price but I can't imagine I would ever get them without getting overcharged some how.  Ridiculous.  I would never use this company again!