Business ProfileforToshiba America Electronic Components - Storage

I bought 1 of Toshiba Canvio Advance 4TB USB 3.2 Gen 1 Portable External Hard Drive - White on July, 04 ****************************** approx. 2 months. The files kept getting corrupted and I would have to reformat it to get it to work again for about 2 weeks before it would do the same thing all over again. I kept trying to use it for about another month or so but it never got any better. It was never dropped or anything else ( it sat on my desk the entire time) . I even tried hooking it up to a powered hub instead of straight to my laptop but it didn't help. I have other HDD's and SSD's connected to my laptop and hub and none of the other ones have had this issue. I contacted Toshiba about this and they told me to send it back to them which I did. About 3 weeks after they received it, they finally issued me a refund for it but it was only a partial refund! I contacted them about that and they told me that they only refund for the item price and not for any tax or shipping you had to pay for ( I also had to pay myself to ship it back to them. ) . The problem is I paid $123.99 for just the item but they only gave me a refund of $99.99. They said there was "some depreciation on the drive" that made the refund that amount. I emailed them back to clarify what that meant but never heard anything back from them. I can only assume that the "depreciation" was either because it was defective ( which is of course why I sent it back. ) or they are prorating the amount because I had it for a couple of months. There is NOTHING in their 2 year warranty about prorating. I understand that items have defects sometimes but that is NO EXCUSE for this kind of response and blatant disregard of their own warranty.