Jio — purchased 4g pack but speed is very slow

Purchased pack of 399 4g forr jio but running very slow only on my area, it was running fine till the first week but later on the speed decreased like 2g. On complaining and asking for money return they stick the same reply that there is an intermittent issues in your area we will look forward to solve when we expand our network. I wouldn't have purchased the pack if the problem have persisted from beginning but it starts after a week i recharged. I demanded for money return but they never worked on it.