Newer model...forced to buy?

Purchase the Floorwhiz butterfly mop several years ago together with a bunch of sponge head refills. I ran out of the sponge heads about a month or so ago and went a store to get a replacement. Upon attempting to replace the sponge I see that the clip design is different. I took it back to the store and they said its a new model and the option available at the time is to buy a new mop to cater for the newer sponge. I informed the person that wont happen because my mop is in perfect condition and I dont see the need to get the later model. I have contacted Verimark around this to which no response has been received which tells me: 1> They could not be bothered as I am sure that I am not the only customer experiencing this challenge. 2> Being forced to buy a new model mop head because they changed the design. If I buy this and they change the model again then it becomes a vicious cycle and obviously for Verimark, a money making endeavor.

It would be good if they allowed customers with the older model some kind of incentive in exchange for the newer model but they prefer to ignore email and see how best to make money of customers.