I bought a kitchen sink with soap pump for the dishes & they only installed * months ag...

I bought a kitchen sink with soap pump for the dishes & they only installed * months ago & the soap pump is not working, I bought them at Lowes. When I try to explained to lowes test I only need the pump soap and there's no reason for me to have someone yo come back to remove the entire kitchen sink, lowes did advised me to call Grohe, I did email your customer service approx over two months ago and I received an email back stating someone from Grohe will get back to me in few weeks & until now no one notify me yet & it been over two months. Right now. It's very inconvenient to use the grohe faucet without able to use the soap pump. Kindly email me at *****@***.com how I return the one piece for the soap pump for replacement. Thank you kindly, Divina.