Nokia Wifi router replaced with a small Vodacom router..

Vodacom fibre is failing dismally,to resolve a small conectivity problem at my house from April.They decided to replace my powerful Nokia Router because they fought with Nokia and gave me something very small which cannot even cover my whole small house.and I am told by such a big company to say If I want the same signal strength then I should be the one buying an extender🤔🤔🤔.They brought their useless technicians 4 times already at my house..