Incorrect Blood Report By Laboratory

My wife has undergone certain blood test under two set of package of tests from Lal Path Lab on 11/03/19 and all blood samples were given at the same time and same day. Incidentally both the test package included fasting blood sugar and the report in one was 87 and other 139. There were other tests too . So my apprehension was if they have mixed up the samples other tests may be incorrect too. I raised this issue by email with Lal Path Lab on 11/03/19 itself and since then they are asking me to wait wait and wait while they find a resolution to this issues. What can I do now legally.