Appeal against summary judgment: Total amount of indebtedness challenged by respondents. Full claimed amount accepted as correct but a portion thereof averred to be a discount, first to be deducted. Deductible amount in dispute: Either a discount agreed upon in the past, to be a credit for appellants, or utilised to facilitate purchase of a company, said to be beneficial for appellants. Factual dispute over this portion of entire claim, to be off-set or not. Potential to be a bona fide defence against this portion. Balance of initial summary judgment application excluding disputed portion, already paid to respondent. Disputed portion referred for hearing of oral evidence. Appeal against rate of interest allowed. Costs of the appeal ordered to be costs in the cause.