Reliance Trends — Exchange not done since 5 days retained my garments and credit note

I purchased garments from gopala Patnam, visakhapatnam trendz store on 2nd October. Due to Covid19 trials are not allowed and exchange can be done they informed. On 3rd October I went for exchange of 1shirt and 2 pants, they told due to some technical problem and they are going to arrange the exchange with in one day and retained credit note and garments. Till date the task was not done. Please do the needful.
Tax invoice: SalesManID:000000
C#60513810 Dt02/10/2020 20:06:07
S#TZ58 Txn#18 R#101
PaymentRefNo# TZ[protected]
TaxInvoice# TZ[protected]