Follow up care

Hi all, my husband had radical surgery and  follow up chemotherapy for bladder and kidney cancer finishing in November last year.

He now has only 1 kidney, no bladder etc and has a stoma. 

He has diabetes which is currently unstable and heart issues for 10 years.

Should I be concerned that he has had no follow up reviews since January despite contacting the urology department. I was expecting something to monitor the remaining kidney.

Who do I contact to see what if anything is going on, as everyone I have spoken to passes me to someone else?

Maybe I just need some reassurance that this is normal practice 

Thanks for reading