I tried to remove data from my local node(peer id 12D3KooWCnAM1KPA5997RfLvyomeTV9karso3K1EehNtw4C4oaDU) with the commands ipfs pin rm and ipfs repo gc but still it shows in my node
Are you sure the data is really there? Try ipfs cat <cid> to find out.
Also, it could be relevant to note that files in MFS (ipfs files ls /) are also not removed in garbage collection.