Boat — non delivery of replacement product and non answering of calls

I had applied for a replacement of my boat rugby speakers on 13 march 2020 before lockdown and it was well approved by boat too. But after that i have got no information as to when will they ship my replacement product as i have already gave them my defected piece. Earlier atleast their customer service used topick up the call and give me false promises but not not even their customer service picks up the phone. I feel very much cheated as it has been 7 months and boat has given me neither information about my product neither sent the replacement.
My complaint id was 1009511.