Indian Oil Corporation [IOC] — Not filled petrol though reading was correctly mentioned

Address:

Elanthoor,Pathanamthitta District,Kerala

On 30th September 2020 in between 5.45 - 6.30 p.m, I have filled petrol for Rs.600 (six hundred only ) at the IOC -Meenakshi Fuels at Elanthoor, Pathanamthitta district, Kerala State . I have seen the meter was working while filling the petrol but later realized my car meter gauge was not showing it, still remains the same meter gauge before arrived the station. .But Today on 1st October I checked with the workshop and confirmed that the meter gauge of my car is perfectly alright.
After that by 12.15 noon, I have contacted to the available number in their website [protected] and got an answer like this "our gas station all filling meters are very genuine and perfect, though he will check and let me know if there is any problem or not'. But so far no reply.
I am sure the petrol was not filled to my car tank, at the same time it may not intentionally . It might be a technical problem.
Please rectify my complaint as early as possible. My phone [protected]