Fixing robotic glove for stroke therapy

Does anybody here have any experience in fixing a robotic glove used for hand stroker therapy? i bought a robotic glove from amazon to help me train my spastic fingers and reduce the spasticity. it was working fine for couple of months but the thumb is now jammed. Does anybody here know if the physiotherapy department can fix these kinds of things. if you have any experience with robotic gloves, would you mind taking a look at mine and see what the problem is? thank you very much