I don't know your area, but there are several different types of doctors that might fill the bill.
Some gerontologists help a lot of people with diabetes.
Endocrinologists see diabetics as half their case load.

As much as 60-70% of all those on dialysis are diabetics.
A few family doctors are very good with diabetes patients.

Go to a local diabetes support group and ask there.
Check out the Diabetes SA website.

Good luck.

Manini there is diabetic clinic in Houghton I think there are specialists there