HP Instant Ink complaint: InstantInk service is very poor and the service is a rip-off

I bought an HP printer in late November 2020. I have just cnacelled my InstantiNk service as I am so dissatisfied with it. The cartridges in my new printer ran out within a day or two and I had to wait nearly two weeks to receive my first delivery of InstantInk. As I need to use the printer a lot immediately (the reason I bought it!) I had no alternative but to buy other HP cartridges from PCWorld. I then received messages reprimanding me for buying and installing these! When I complained about the service to Instantink it was ignored. Now I have cancelled the service I find that the cartridges installed have ben disabled so I didn’t receive any significant benefit from the introductory three month offer. I am now also being charged an extortionate price for the printing I did largely with cartridges that I had to pay for myself. I shall never recommend Instantink to others and will not be buying another HP printer as you deceive your customers with your offers and promises and treat them with disrespect.