34-31.1.The Grantee may require a reasonable, non-discriminatory deposit on equipment provided to subscribers. Deposits shall be placed in an interest-bearing account. On termination of service (and except where the subscriber owes the Grantee money or has damaged or failed to return the equipment) the Grantee shall return the deposit, plus interest earned to the date of repayment to the subscriber within the earlier of thirty (30) days or the date which had been scheduled for the subscriber’s next billing cycle.