You should write him a legal notice stating that you have been diligently paying the rent in the form of cash for which you have received no receipt and when asked about the same, you are being asked to vacate, which is irrational and illegal order.
First and foremost, find a witness who can prove that you actually paid your landlord in cash. This will make the burden of proof easier on you, in case your landlord sues you.
In case your landlord sues you, he can easily prove that you didn't pay rent as you paid in cash and have no proof of it. However, it'll be a task for you to prove that you paid the rent because you have no receipt or proof.
Under the Rent Control Act, landlords can evict tenants only under specific grounds, which include wilful default in rent payment, subletting without the prior consent, causing nuisance or when the landlord himself requires premises for personal occupation.
Section 106 of the Transfer of Property Act, 1882 talks about illegal eviction.
Regards,
Anaita Vas