You're not alone in being told to test less often. My GP is very good & gives me all the strips that I need, but many try to save money by telling people to test less often; it's a disgrace. More frequent testing leads to better control, resulting in fewer complications, which in the long term is cheaper for the NHS & better for our health.
Any diabetes specialist will tell you that 4 times per day is a minimum for insulin users, once before each meal & at bed time. If your day is not routine, you're sick, or are exercising, then lots more tests are required. I test a minimum of 150 times per month, often much more.
When you refer to your doctor, I assume that you mean your GP, if they keep down that road, get your hospital consultant or DSN to speak/write to them, if you don't go to the hospital for check ups, ask to be referred for specialist care; it's your right.