transmission rebuild

Was charged for a total rebuild of transmission, master rebuild kit, this transmission is leaking from shifter/auto kickdown cable/speedometer. Tranni is chattering and skipping /shaking in reverse and takes 10seconds before engaging into drive. Took it back Skip he added fluid and put etc gasket maker on these things. Shook my hand and said 'let me know if anything else goes wrong' Everything still leaking, tranni still skipping and chattering in reverse and takes forever to engage in drive. Wish I could get my $900 back and take it to someone that knows what they're doing.