Hello sir.
From your report it seems that you have signs of septecimia, triggered by DM and old age.
the septicimia can cause organ failure or aggravate already pre existing organ dysfunctions ,especially kidneys and
liver, the 2 toxin cleaning organs .
antibiotics are prescribed to treat the infection and the dr has done it correctly.
Next Steps
As you have written Renal failure, is it end stage renal failure , told by dr? if yes you need to consult nephrologist.
or if it is acute renal injury caused by infection ? pl ask your treating dr for details or you can chat with me for further advice