A tenant is entitled to peaceable occupation of a tenancy, and if you wish to inspect the property than a mutually agreeable time must be arranged. However, if the tenant continually refuses you access to the property, they are in breach of their obligation as a tenant. A Tenant is entitled to reasonable time to rectify the breach of obligations. You should first write to the tenant, outlining the below, and requesting a mutually agreeable time for inspections. If the issue persists after the tenant has received the letter, you may issue a 28 day notice of termination for breach of tenant obligations.
It is recommended that all correspondence, including texts, between you and the tenant, are retained for record.