Evok — delayed delivery and no assembly/ installation

Address: Somany Home Innovation Limited 68, Echelon Inst. Area, Sector-32, Gurugram, Haryana 122 001, India.

I had ordered a shoe rack from evok-hindware on 31st may 2020, which reached me in kolkata on the 22nd of june 2020, (Order no.[protected]. They had said it would take 10 to 15 working days but it took much longer.
The next step was requesting for the assembly/ installation which was done on the same day that the order was delivered (Ref no. Mj50009) and again it was to be done within 3 to 4 working days but has still not been done by the 30th of june 2020.
Further, it is extremely difficult to reach the customer service personnel, and even on occasion that the line does get connected they are unable to figure out anything on their own, and even resort to telling me that such an order did never exist, very surprising, how it was delivered then.
Would be extremely grateful if the personnel in charge do manage to complete the assembly/ installation over the next month, because the delivery itself took them a month.